Job 38:19

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 It comes in the morning, and is withdrawn at evening, and it seems as if it came from some far distant dwelling-place in the morning to illuminate the world, and then retired to its home in the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 It is represented as having a place of abode as coming forth to take the place of light when that is withdrawn, and again as retiring to its dwelling when the light reappears.