When the keepers of the house shall tremble, and the strong men shall stagger, and the grinders shall be idle in a small number, and they that look through the holes shall be darkened:

In the day that keepers of the house tremble, And men of strength have bowed themselves, And grinders have ceased, because they have become few. And those looking out at the windows have become dim,

In the day when the keepers of the house are shaking for fear, and the strong men are bent down, and the women who were crushing the grain are at rest because their number is small, and those looking out of the windows are unable to see;

In the day when the keepers of the house shall tremble, and the strong men shall bow themselves, and the grinders cease because they are few, and those that look out shall be darkened in the windows,

when the guardians of the house will tremble, and the strongest men will waver, and those who grind grain will be idle, except for a small number, and those who look through the keyholes will be darkened.

The body in old age and death is here described under the figure of a decaying house with its inmates and furniture.
This verse is best understood as referring to the change which old age brings to four parts of the body, the arms ("the keepers"), the legs ("the strong men"), the teeth ("the grinders"), and the eyes.

In the day when the keepers of the house - The Body of man is here compared to a House: - mark the metaphors and their propriety.
1. The keepers shall tremble - the hands become paralytic, as is constantly the case, less or more, in old age.
2. The strong men shall bow - The legs become feeble, and unable to support the weight of the body.
3. The grinders cease because they are few - The teeth decayed and mostly lost; the few that remain being incapable of properly masticating hard substances or animal food. And so they cease; for soft or pulpy substances, which are requisite then, require little or no mastication; and these aliments become their ordinary food.
4. Those that look out of the windows - The optic nerves, which receive impressions, through the medium of the different humours of the eye, from surrounding objects - they are darkened; the humours becoming thick, flat, and turbid, they are no longer capable of transmitting those images in that clear, distinct manner, as formerly. There may be an allusion here to the pupil of the eye. Look into it, and you will see your own image in extreme minature looking out upon you; and hence it has its name pupillus, a little child, from pupus, a baby, a doll; because the image in the eye resembles such. The optic nerve being seated at the bottom of the eye, has the images of surrounding objects painted upon it; it looks out through the different humors. The different membranes and humours which compose the eye, and serve for vision, are, the tunica conjunctiva, the tunica sclerotica, the cornea, the iris, the pupil, the choroides, and the retina. The iris is perforated to admit the rays of light, and is called the pupil; the retina is a diffusion of the optic nerve in the bottom of the eye, on which the images are painted or impressed that give us the sensation we term sight or vision. All these membranes, humours, and nerves, are more or less impaired, thickened, or rendered opaque, by old age, expressed by the metaphor, "Those that look out of the windows are darkened."

In the day when the (b) keepers of the house shall tremble, and the (c) strong men shall bow themselves, and the (d) grinders cease because they are few, and those that (e) look out of the windows shall be darkened,
(b) The hands which keep the body.
(c) The legs.
(d) The teeth.
(e) The eyes.

In the day when the keepers of the house shall tremble,.... By the "house" is meant the human body; which is a house of clay, the earthly house of our tabernacle, in which the soul dwells, Job 4:19, 2-Corinthians 5:1. The Targum interprets the keepers of the house, of the knees and the trembling of them; but the Midrash and Jarchi, much better, of the ribs; man being fenced with bones and sinews, as Job says, Job 10:11; though trembling cannot be well ascribed to them, they being so fixed to the backbone: rather therefore, as Aben Ezra, the hands and arms are meant; which work for the maintenance of the body, and feed it with food, got and prepared by them; and which protect and defend it from injuries; for all which they are fitted, and made strong by the God of nature. The Arabic version renders it, "both keepers"; and, doubtless, respects both hands and arms; and which, in old age, are not only wrinkled, contracted, and stiff, but attended with numbness, pains, and tremor. Some, not amiss, take in the head; which is placed as a watchtower over the body, the seat of the senses; which overlooks, guards, and keeps it, and which often through paralytic disorders, and even the weakness of old age, is attended with a shaking;
and the strong men shall bow themselves; it is strange the Targum and Midrash should interpret this of the arms, designed in the former clause; Jarchi and Aben Ezra, more rightly, of the thighs; it takes in thighs, legs, and feet, which are the basis and support of the human body; and are strengthened for this purpose, having stronger muscles and tendons than any other parts of the body; but these, as old age comes on, are weakened and distorted, and bend under the weight of the body, not being able, without assistance, to sustain it;
and the grinders cease because they are few; the Targum is,
"the teeth of the mouth:''
all agree the teeth are meant; only the Midrash takes in the stomach also, which, like a mill, grinds the food. There are three sorts of teeth; the fore teeth, which bite the food, and are called "incisores": the eye teeth, called "canini", which bruise and break the food; and the double teeth, the hindermost, which are called "dentes molares", the grinding teeth; and which being placed in the upper and nether jaw, are like to millstones, broad and rough, and rub against each other and grind the food, and prepare it for the stomach: these, in old age, rot and drop out, and become few and straggling, one here and another there; and, not being over against each other, are of no use, but rather troublesome;
and those that look out of the windows be darkened; the eyes, as the Targum and Ben Melech; and all agree that those that look out are the eyes, or the visive rays: the "windows" they look through are not spectacles; for it is questionable whether they were in use in Solomon's time, and, however, they are not parts of the house; but either the holes in which the eyes are, and so the Septuagint and Vulgate Latin versions render it, to which the Targum agrees, paraphrasing it, the strong bounds of the head; and which are no other than what oculists call the orbits of the eye: or else the eyelids, which open and shut like the casement of a window, and through which, being opened, the eyes look; or the humours of the eye, the watery, crystalline, and glassy, which are transparent, and through which the visive rays pass; or the tunics, or coats of the eye, particularly the "tunica aranea" and "cornea"; as also the optic nerves, and especially the "pupilla", or apple of the eye, which is perforated or bored for this purpose: now these, in old age, become weak, or dim, or thick, or contracted, or obstructed by some means or another by which the sight is greatly hindered, and is a very uncomfortable circumstance; this was Isaac's case, Genesis 27:1; but Moses is an exception to the common case of old men, Deuteronomy 34:7.

keepers of the house--namely, the hands and arms which protected the body, as guards do a palace (Genesis 49:24; Job 4:19; 2-Corinthians 5:1), are now palsied.
strong men . . . bow-- (Judges 16:25, Judges 16:30). Like supporting pillars, the feet and knees (Song 5:15); the strongest members (Psalm 147:10).
grinders--the molar teeth.
cease--are idle.
those that look out of the windows--the eyes; the powers of vision, looking out from beneath the eyelids, which open and shut like the casement of a window.

To the thought: Ere the mind and the senses begin to be darkened, and the winter of life with its clouds and storms approaches, the further details here following stand in a subordinate relation: "That day when the watchers of the house tremble, and the strong men bow themselves, and the grinders rest, because they have become few, and the women looking out of the windows are darkened." Regarding בּיּום with art.: eo (illo) tempore, vid., under Song 8:8. What follows is regarded by Winzer, with Mich., Spohr, and partly Nachtigal, as a further description of the night to which old age, Ecclesiastes 12:2, is compared: Watchers then guard the house; labourers are wearied with the labours and cares of the day; the maids who have to grind at the mill have gone to rest; and almost all have already fallen asleep; the women who look out from the windows are unrecognisable, because it has become dark. But what kind of cowardly watchers are those who "tremble," and what kind of (per antiphrasin) strong men who "bow themselves" at evening like children when they have belly-ache! Ginsburg regards Ecclesiastes 12:2-5 as a continuation of the description of the consequences of the storm under which human life comes to an end: the last consequence is this, that they who experience it lose the taste for almonds and the appetite for locusts. But what is the meaning of this quaint figure? it would certainly be a meaningless and aimless digression. Taylor hears in this verse the mourning for the dead from Ecclesiastes 12:2, where death is described: the watchers of the house tremble; the strong men bow themselves, viz., from sorrow, because of the blank death has made in the house, etc.; but even supposing that this picture had a connection in Ecclesiastes 12:2, how strange would it be! - the lookers out at the windows must be the "ladies," who are fond of amusing themselves at windows, and who now - are darkened. Is there anything more comical than such little ladies having become darkened (whether externally or internally remains undetermined)? However one may judge of the figurative language of Ecclesiastes 12:2, Ecclesiastes 12:3 begins the allegorical description of hoary old age after its individual bodily symptoms; interpreters also, such as Knobel, Hitz., and Ewald, do not shrink from seeking out the significance of the individual figures after the old Haggadic manner. The Talm. says of shomrē habbayith: these are the loins and ribs; of the anshē hehhayil: these are the bones; of harooth baarǔbboth: these, the eyes. The Midrash understand the watchers of the house, of the knees of the aged man; the men of strength, of his ribs or arms; the women at the mill, of the digestive organs (המסס,
(Note: This hamses is properly the second stomach of the ruminants, the cellular caul.)
the stomach, from omasum); those who have become few, of the teeth; the women looking out at the window, of the eyes; another interpretation, which by harooth thinks of the lungs, is not worth notice.
Here also the Targ. principally follows the Midrash: it translates the watchers of the house by "thy knees;" strong men by "thine arms;" the women at the mill by "the teeth of thy mouth;" the women who look out at the window by "thine eyes." These interpretations for the most part are correct, only those referable to the internal organs are in bad taste; references to these must be excluded from the interpretation, for weakness of the stomach, emphysema of the lungs, etc., are not appropriate as poetical figures. The most common biblical figures of the relation of the spirit or the soul to the body is, as we have shown, Psychol. p. 227, that of the body as of the house of the inner man. This house, as that of an old man, is on all sides in a ruinous condition. The shomrē habbayith are the arms terminating in the hands, which bring to the house whatever is suitable for it, and keep away from it whatever threatens to do it injury; these protectors of the house have lost their vigour and elasticity (Genesis 49:24), they tremble, are palsied (יזעוּ, from זוּע, Pilp. זעזע, bibl. and Mishn.: to move violently hither and thither, to tremble, to shake),
(Note: Vid., Friedr. Delitzsch's Indogerm.-Sem. Stud. p. 65f.)
so that they are able neither to grasp securely, to hold fast and use, nor actively to keep back and forcibly avert evil. Anshē hěhhayil designates the legs, for the shoqē haish are the seat of his strength, Psalm 147:10; the legs of a man in the fulness of youthful strength are like marble pillars, Song 5:15; but those of the old man hith'authu (Hithpa. only here) have bowed themselves, they have lost their tight form, they are shrunken (כּרעות, Job 4:4, etc.) and loose; 4 Macc. 4:5 calls this τὴν ἐκ τοῦ γήρως νωθρότητα ποδῶν ἐπικύφοον. To maidens who grind (cf. טח בר, Numbers 11:8 and Isaiah 47:2) the corn by means of a hand-mill are compared the teeth, the name of which in the old language is masc., but in the modern (cf. Proverbs 29:19), as also in the Syr. and Arab., is fem.; the reference of the figure to these instruments for grinding is not to be missed; the Arab. ṭḥinat and the Syr. ṭaḥonto signify dens molaris, and we now call 6 of the 32 teeth Mahlzhne (molar teeth, or grinders); the Greeks used for them the word μύλαι (Psalm 57:7, lxx). Regarding בּטלוּ, lxx ἤργησαν (= ἀερτοὶ ἐγενήθησαν)
(Note: We find a similar allegory in Shabbath 152a. The emperor asked the Rabbi Joshua b. Chananja why he did not visit בי אבידן (a place where learned conversation, particularly on religious subjects, was carried on). He answered: "The mount is snow (= the hair of the head is white), ice surrounds me (= whiskers and beard on the chin white), its (of my body) dogs bark not (the voice fails), and its grinders (the teeth) grind not." The proper meaning of בי אבידן, Levy has not been able clearly to bring to light in his Neuhebr. u. Chald. W.B.)
The clause מעטוּ כּי (lxx ὃτι ὠλιγώθησαν) assigns the reason that the grinders rest, i.e., are not at work, that they have become few: they stand no longer in a row; they are isolated, and (as is to be supposed) are also in themselves defective. Taylor interprets mi'etu transitively: the women grinding rest when they have wrought a little, i.e., they interrupt their labour, because on account of the occurrence of death, guests are now no longer entertained; but the beautiful appropriate allegory maintains its place against this supposed lamentation for the dead; also מעט does not signify to accomplish a little (Targ.), but to take away, to become few (lxx, Syr., Jerome, Venet. Luther), as such as Pih. as Ecclesiastes 10:10, קהה, to become blunt. And by הראות בּא we are not to think, with Taylor, of women such as Sidera's mother or Michal, who look out of the window, but of the eyes, more exactly the apples of the eyes, to which the orbita (lxx ἐν ταῖς ὀπαῖς; Symm. διὰ τῶν ὀπῶν) and the eyelids with the eye-lashes are related as a window is to those who look out; ארבּה (from ארב, R. רב, to entwine firmly and closely) is the window, consisting of a lattice of wood; the eyes are, as Cicero (Tusc. i. 20) calls them, quasi fenestrae animi; the soul-eyes, so to speak, without which it could not experience what sight is, look by means of the external eyes; and these soul-bodily eyes have become darkened in the old man, the power of seeing is weakened, and the experiences of sight are indistinct, the light of the eyes is extinguished (although not without exception, Deuteronomy 34:7).

The house - Of the body: whose keepers are the hands and arms, which are man's best instruments to defend his body; and which in a special manner are subject to his trembling. The strong men - The thighs and legs, in which the main strength of the body consists. Grinders - The teeth, those especially which are commonly so called, because they grind the meat. Cease - To perform their office. And those, &c. - The eyes. By windows he understands either the eye - lids, which like windows, are either opened or shut: or, those humours and coats of the eyes, which are the chief instruments by which we see.