Where is the way where light dwelleth? - Or, rather, where is the way or path to the place where light dwells? Light is conceived of as coming from a great distance, and as having a place which might be regarded as its home. It comes in the morning, and is withdrawn at evening, and it seems as if it came from some far distant dwelling-place in the morning to illuminate the world, and then retired to its home in the evening, and thus gave place for darkness to visit the earth. The idea is this, "Dost thou know, when the light withdraws from the world, to what place it betakes itself as its home? Canst thou follow it to its distant abodes, and tell where they are? And when the shadows of night come forth, and take its place, canst thou tell whence they come; and when they withdraw again in the morning, canst thou follow them, and tell where they are congregated together to abide?" The thought is highly poetic, and is not to be taken literally. The meaning is, that God only could know what was the great fountain of light, and where that was; and the question substantially may be asked of man with as much force and propriety now as in the time of Job. Who knows what is the great fountain of light to the universe? Who knows what light is? Who can explain the causes of its rapid flight from world to world? Who can tell what supplies it, and prevents it from being exhausted? Who but God, after all the discoveries of science, can fully understand this?
And as for darkness, where is the place thereof? - Darkness here is personified. It is represented as having a place of abode as coming forth to take the place of light when that is withdrawn, and again as retiring to its dwelling when the light reappears.

Where light dwelleth - What is the source of light? Yea, what is light itself? It is not in the sun, for light was before the sun; but what is light? It is no doubt a substance; but of what kind? and of what are its particles? As to darkness, what is It? Is it philosophical to say, it is the mere privation of light? I shall think philosophy has made some advances to general accuracy and perfection when it proves to us what cold is, and what darkness is, leaving mere privations out of the question.

Where is the way where light dwelleth?.... Or the way to the place where it dwells, and what that is;
and as for darkness, where is the place thereof? where these were placed when they were first separated at the creation? where light goes and dwells, when it departs from us at sun setting? and where the darkness betakes itself, and makes its abode at sun rising? What is the chamber of the sun, and the tabernacle of it? from whence it sets out, and whither it returns? And though these questions may be answered by geographers and astronomers in their way; yet they seem to respect chiefly the disposal of light and darkness, in such a manner as to cause the revolution of them, and the inequality of days and nights in different seasons and climates; and which is not in the power of men to effect, but depends on the sovereign will of God.

The marvels in heaven. "What is the way (to the place wherein) light dwelleth?" The origin of light and darkness. In Genesis 1:3-5, Genesis 1:14-18, "light" is created distinct from, and previous to, light-emitting bodies, the luminaries of heaven.

Dwelleth - Hath its constant and settled abode. Whether goes the sun when it departs from this hemisphere? Where is the tabernacle and the chamber in which he is supposed to rest? And seeing there was a time when there was nothing but gross darkness upon the face of the earth, what way came light into the world? Which was the place where light dwelt at that time, and whence was it fetched? And whence came that orderly constitution and constant succession of light and darkness? Was this thy work? Or wast thou privy to it, or a counsellor, or assistant in it?