Wherefore I abhor myself - I see that I am a sinner to be loathed and abhorred. Job, though he did not claim to be perfect, had yet unquestionably been unduly exalted with the conception of his own righteousness, and in the zeal of his argument, and under the excitement of his feelings when reproached by his friends, had indulged in indefensible language respecting his own integrity. He now saw the error and folly of this, and desired to take the lowest place of humiliation. Compared with a pure and holy God, he saw that he was utterly vile and loathsome, and was not unwilling now to confess it. "And repent." Of the spirit which I have evinced; of the language used in self-vindication; of the manner in which I have spoken of God. Of the general sentiments which he had maintained in regard to the divine administration as contrasted with those of his friends he had no occasion to repent, for they were correct Job 42:8, nor had he occasion to repent "as if" he had never been a true penitent or a pious man. But he now saw that in the spirit which he had evinced under his afflictions, and in his argument, there was much to regret; and he doubtless saw that there had been much in his former life which had furnished occasion for bringing these trials upon him, over which he ought now to mourn.
In dust and ashes - In the most lowly manner, and with the most expressive symbols of humiliation. It was customary in times of grief, whether in view of sin or from calamity, to sit down in ashes (see the notes at Job 2:8; compare Daniel 9:3; Jonah 3:6; Matthew 11:21); or on such an occasion the sufferer and the penitent would strew ashes over himself; compare Isaiah 58:5. The philosophy of this was - like the custom of wearing "black" for mourning apparel - that the external appearance ought to correspond with the internal emotions, and that deep sorrow would be appropriately expressed by disfiguring the outward aspect as much as possible. The sense here is, that Job meant to give expression to the profoundest and sincerest feelings of penitence for his sins. From this effect produced on his mind by the address of the Almighty, we may learn the following lessons:
(1) That a correct view of the character and presence of God is adapted to produce humility and penitence; compare Job 40:4-5. This effect was produced on the mind of Peter when, astonished by a miracle performed by the Savior which none but a divine being could have done, he said, "Depart from me, for I am a sinful man, O Lord;" Luke 5:8. The same effect; was produced on the mind of Isaiah after he had seen Yahweh of Hosts in the temple: "Then said I, Wo is me, for I am undone; because I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for mine eyes have seen the king, the Lord of Hosts;" Isaiah 6:5. No man can have any elevated views of his own importance or purity, who has right apprehensions of the holiness of his Creator.
(2) Such a view of the presence of God will produce what no argument can in causing penitence and humility. The friends of Job had reasoned with him in vain to secure just this state of mind; they had endeavored to convince him that he was a great sinner, and "ought" to exercise repentance. But he met argument with argument; and all their arguments, denunciations, and appeals, made no impression on his mind. When, however, God manifested himself to him, he was melted into contrition, and was ready to make the most penitent and humble confession. So it is now. The arguments of a preacher or a friend often make no impression on the mind of a sinner. He can guard himself against them. He can meet argument with argument, or can coolly turn the ear away. But he has no such power to resist God, and when "he" manifests himself to the soul, the heart is subdued, and the proud and self-confident unbeliever becomes humbled, and sues for mercy.
(3) A good man will be willing to confess that he is vile, when he has any clear views of God. He will be so affected with a sense of the majesty and holiness of his Maker, that he will be overwhelmed with a sense of his own unworthiness.
(4) The most holy men may have occasion to repent of their presumptuous manner of speaking of God. We all err in the same way in which Job did. We reason about God with irreverence; we speak of his government as if we could comprehend it; we discourse of him as if he were an equal; and when we come to have any just views of him, we see that there has been much improper boldness, much self-confidence, much irreverence of thought and manner, in our estimation of the divine wisdom and plans. The bitter experience of Job should lead us to the utmost carefulness in the manner in which we speak of our Maker.

I abhor myself - Compared with thine, my strength is weakness; my wisdom, folly; and my righteousness, impurity.
"I loathe myself when thee I see;
And into nothing fall."
Repent - I am deeply distressed on account of the imaginations of my heart, the words of my tongue, and the acts of my life. I roll myself in the dust, and sprinkle ashes upon my head. Job is now sufficiently humbled at the feet of Jehovah; and having earnestly and piously prayed for instruction, the Lord, in a finishing speech, which appears to be contained in Job 40:1-14, perfects his teaching on the subject of the late controversy, which is concluded with, "When thou canst act like the Almighty," which is, in effect, what the questions and commands amount to in the preceding verses of that chapter, "then will I also confess unto thee, that thy own right hand can save thee." In the fifth verse of the fortieth chapter, Job says, "Once have I spoken." This must refer to the declaration above, in the beginning of this chapter, (42). And he goes on to state, Job 40:5 : "Yea, Twice; but I will proceed no farther." This second time is that in which he uses these words: after which he spoke no more; and the Lord concluded with the remaining part of these fourteen verses, viz., from Job 40:7-14, inclusive. Then the thread of the story, in the form of a narration is resumed at Job 42:7.

Wherefore I abhor myself,.... Or all my words, as Aben Ezra; all the indecent expressions he had uttered concerning God; he could not bear to think of them; he loathed them, and himself on account of them: sin is abominable in its own nature, and makes men so; it is loathsome to God, and so it is to all good men when they see it in its proper light; am especially when they have a view of the purity and holiness of God, to which that is so very contrary, and also of his grace and goodness in the forgiveness of it; see Isaiah 6:3, Ezekiel 16:63;
and repent in dust and ashes; which was an external ceremony used by mournful and penitent persons; see Job 2:8; and is expressive of the truth and sincerity of repentance; and never do any more truly mourn for sin and repent of it, are more ashamed of it, or have a more godly sorrow for it, or more ingenuously confess it, and heartily forsake it, than those who with an eye of faith behold God in Christ as a sin forgiving God; or behold their sins through the glass of pardoning grace and mercy; see Zac 12:10.

myself--rather "I abhor," and retract the rash speeches I made against thee (Job 42:3-4) [UMBREIT].