He hath founded the earth upon its foundations Here the prophet celebrates the glory of God, as manifested in the stability of the earth. Since it is suspended in the midst of the air, and is supported only by pillars of water, how does it keep its place so steadfastly that it cannot be moved? This I indeed grant may be explained on natural principles; for the earth, as it occupies the lowest place, being the center of the world, naturally settles down there. But even in this contrivance there shines forth the wonderful power of God. Again, if the waters are higher than the earth, because they are lighter, why do they not cover the whole earth round about? Certainly the only answer which philosophers can give to this is, that the tendency of the waters to do so is counteracted by the providence of God, that a dwelling-place might be provided for man. If they do not admit that the waters are restrained by the determinate appointment of God, they betray not only their depravity and unthankfulness, but also their ignorance, and are altogether barbarous. The prophet, therefore, not without reason, recounts among the miracles of God, that which would be to us wholly incredible, did not even experience show its truth. We are very base indeed if, taught by such undoubted a proof, we do not learn that nothing in the world is stable except in as far as it is sustained by the hand of God. The world did not originate from itself, consequently, the whole order of nature depends on nothing else than his appointment, by which each element has its own peculiar property. Nor is the language of the prophet to be viewed merely as an exhortation to give thanks to God; it is also intended to strengthen our confidence in regard to the future, that we may not live in the world in a state of constant fear and anxiety, as we must have done had not God testified that he has given the earth for a habitation to men. It is a singular blessing, which he bestows upon us, in his causing us to dwell upon the earth with undisturbed minds, by giving us the assurance that he has established it upon everlasting pillars. Although cities often perish by earthquakes, yet the body of the earth itself remains. Yea, all the agitations which befall it more fully confirm to us the truth, that the earth would be swallowed up every moment were it not preserved by the secret power of God.

Who laid the foundations of the earth - Referring still to the creation of the earth. The margin is, "He hath founded the earth upon her bases." The Hebrew word rendered in the margin "her bases" means properly a place; then a basis or foundation. The idea is, that there wes something, as it were, placed under the earth to support it. The idea is not uncommon in the Scriptures. Compare the notes at Job 38:4.
That it should not be removed for ever - So that it cannot be shaken out of its place. That is, It is fixed, permanent, solid. Its foundations do not give way, as edifices reared by man. but it abides the same from age to age - the most fixed and stable object of which we have any knowledge. Compare the notes at Psalm 78:69.

יסד ארץ על מכוניה yasad erets al mechonepha,
בל תמוט עולם ועד bal tammot olam vaed.
"Laying the earth upon its foundations,
That it should not be shaken for evermore."
This image Bishop Lowth thinks evidently taken from the tabernacle, which was so laid upon its foundations that nothing could move it, and the dispensation to which it was attached, till the end purposed by the secret counsel of God was accomplished: and thus the earth is established, till the end of its creation shall be fully answered; and then it and its works shall be burnt up. On the above ground, the stability of the sanctuary and the stability of the earth are sometimes mentioned in the same words.

Who laid the foundations of the earth,.... Or "founded the earth upon its bases" (l); which some take to be the waters, according to Psalm 24:2, others the centre of gravity in it; others the mountains; others the circumambient air, by which it is poised; rather the almighty power of God, by which it subsists; this is the work of Christ the Almighty; see Hebrews 1:3.
That it should not be removed for ever: for though it may be shaken by earthquakes, yet not removed; nor will it be until the dissolution of all things, when it shall flee away before the face of the Judge, and a new earth shall succeed, Revelation 20:11.
(l) "super bases ejus", Montanus, Musculus, Junius & Tremellius, Piscator; so the Tigurine version, Gejerus, Michaelis.

The earth is firmly fixed by His power.

In a second decastich the poet speaks of the restraining of the lower waters and the establishing of the land standing out of the water. The suffix, referring back to ארץ, is intended to say that the earth hanging free in space (Job 26:7) has its internal supports. Its eternal stability is preserved even amidst the judgment predicted in Isaiah 24:16., since it comes forth out of it, unremoved from its former station, as a transformed, glorified earth. The deep (תּהום) with which God covers it is that primordial mass of water in which it lay first of all as it were in embryo, for it came into being ἐξ ὕδατος καὶ δι ̓ ὕδατος (2-Peter 3:5). כּסּיתו does not refer to תהום (masc. as in Job 28:14), because then עליה would be required, but to ארץ, and the masculine is to be explained either by attraction) according to the model of 1-Samuel 2:4), or by a reversion to the masculine ground-form as the discourse proceeds (cf. the same thing with עיר 2-Samuel 17:13, צעקה Exodus 11:6, יד Ezekiel 2:9). According to Psalm 104:6, the earth thus overflowed with water was already mountainous; the primal formation of the mountains is therefore just as old as the תהום mentioned in direct succession to the תהו ובהו. After this, Psalm 104:7 describe the subduing of the primordial waters by raising up the dry land and the confining of these waters in basins surrounded by banks. Terrified by the despotic command of God, they started asunder, and mountains rose aloft, the dry land with its heights and its low grounds appeared. The rendering that the waters, thrown into wild excitement, rose up the mountains and descended again (Hengstenberg), does not harmonize with the fact that they are represented in Psalm 104:6 as standing above the mountains. Accordingly, too, it is not to be interpreted after Psalm 107:26 : they (the waters) rose mountain-high, they sunk down like valleys. The reference of the description to the coming forth of the dry land on the third day of creation requires that הרים should be taken as subject to יעלוּ. But then, too, the בקעות are the subject to ירדוּ, as Hilary of Poictiers renders it in his Genesis, 5:97, etc.: subsidunt valles, and not the waters as subsiding into the valleys. Hupfeld is correct; Psalm 104:8 is a parenthesis which affirms that, inasmuch as the waters retreating laid the solid land bare, mountains and valleys as such came forth visibly; cf. Ovid, Metam. i. 344: Flumina subsidunt, montes exire videntur.

Who laid - Hebrews. he hath established the earth upon its own basis, whereby it stands as fast and unmoveable, as if it were built upon the strongest foundations. Forever - As long as the world continues. God has fixt so strange a place for the earth, that being an heavy body, one would think it should fall every moment. And yet which way so ever we would imagine it to stir, it must, contrary to the nature of such a body, fall upwards, and so can have no possible ruin, but by tumbling into heaven.