Genesis 1:4

God divided the light from the darkness - This does not imply that light and darkness are two distinct substances, seeing darkness is only the privation of light; but the words simply refer us by anticipation to the rotation of the earth round its own axis once in twenty-three hours, fifty-six minutes, and four seconds, which is the cause of the distinction between day and night, by bringing the different parts of the surface of the earth successively into and from under the solar rays; and it was probably at this moment that God gave this rotation to the earth, to produce this merciful provision of day and night. For the manner in which light is supposed to be produced, see Genesis 1:16, under the word sun.

Then saw God the light that it was good. - God contemplates his work, and derives the feeling of complacence from the perception of its excellence. Here we have two other archetypal faculties displayed in God, which subsequently make their appearance in the nature of man, the understanding, and the judgment.

The perception of things external to Himself is an important fact in the relation between the Creator and the creature. It implies that the created thing is distinct from the creating Being, and external to Him. It therefore contradicts pantheism in all its forms.

The judgment is merely another branch of the apprehensive or cognitive faculty, by which we note physical and ethical relations and distinctions of things. It comes immediately into view on observing the object now called into existence. God saw "that it was good." That is good in general which fulfills the end of its being. The relation of good and evil has a place and an application in the physical world, but it ascends through all the grades of the intellectual and the moral. That form of the judgement which takes cognizance of moral distinctions is of so much importance as to have received a distinct name, - the conscience, or moral sense.

Here the moral rectitude of God is vindicated, inasmuch as the work of His power is manifestly good. This refutes the doctrine of the two principles, the one good and the other evil, which the Persian sages have devised in order to account for the presence of moral and physical evil along with the good in the present condition of our world.

Divided between the light and between the darkness. - God then separates light and darkness, by assigning to each its relative position in time and space. This no doubt refers to the vicissitudes of day and night, as we learn from the following verse:

1:3-5 We have here a farther account of the first day's work. In which observe, 1. That the first of all visible beings which God created was light, the great beauty and blessing of the universe: like the first-born, it doth, of all visible beings, most resemble its great parent in purity and power, brightness and beneficence. 2. That the light was made by the word of God's power; He said, Let there be light - He willed it, and it was done; there was light - Such a copy as exactly answered the original idea in the eternal mind. 3. That the light which God willed, he approved of.

God saw the light, that it was good — 'Twas exactly as he designed it; and it was fit to answer the end for which he designed it. 4. That God divided the light from the darkness - So put them asunder as they could never be joined together: and yet he divided time between them, the day for light, and the night for darkness, in a constant succession. Tho' the darkness was now scattered by the light, yet it has its place, because it has its use; for as the light of the morning befriends the business of the day, so the shadows of the evening befriend the repose of the night. God has thus divided between light and darkness, because he would daily mind us that this is a world of mixtures and changes. In heaven there is perpetual light, and no darkness; in hell utter darkness, and no light: but in this world they are counter-changed, and we pass daily from one to another; that we may learn to expect the like vicissitudes in the providence of God. 5. That God divided them from each other by distinguishing names. He called the light Day, and the darkness he called night - He gave them names as Lord of both. He is the Lord of time, and will be so 'till day and night shall come to an end, and the stream of time be swallowed up in the ocean of eternity. 6. That this was the first day's work, The evening and the morning were the first day - The darkness of the evening was before the light of the morning, that it might set it off, and make it shine the brighter.