For God, who commanded the light to shine out of darkness,.... The causal particle for, shows these words to be also a reason of the foregoing; either why they so clearly beheld the glory of the Lord, 2Co 4:18 or why they renounced the hidden things of dishonesty, 2Co 4:2 or why their Gospel could not be hid, 2Co 4:3 or why they did not preach themselves, but Christ, 2Co 4:5 because God hadshined in their hearts; and in this light, they saw the glory of Christ; could not bear any secret, hidden, scandalous practices; and held forth the word of light and life to others; and seeing so much of their own weakness, sinfulness, and unworthiness, dared not to preach themselves, but Christ Jesus the Lord; in which may be observed the character of the true God, as opposed to Satan, the god of this world, who is said to blind the minds of men, 2Co 4:6 whereas the true God is represented as the author of "light", and as producing it by a word of "command", and that "out" of mere "darkness"; respect is here had to the creation of all things at the beginning, when "darkness was upon the face of the deep--and God said, let there be light and there was light", Ge 1:2.
Now this character of God, as creating light in this wonderful manner, is prefaced to his giving spiritual light unto his people; because of the agreement there is between light corporeal and spiritual, in their nature and production; for as there was darkness upon the earth before there was light, so there is a natural darkness in the minds of men, before any spiritual light is infused into them; and as light was the first production out of the dark and unformed chaos, so light is the first thing that is struck into the soul in conversion; moreover, as light was the effect of almighty power, so is the spiritual illumination, or the opening of the eyes of the understandings of men, who are naturally born blind; and as light was a creation of that which was not before, so the work of grace on the soul is not an increase of, or an addition to, or an improvement of the light of nature, but it is a new light, created in the understanding; add to all this, that both corporeal and spiritual light are good, and both called "day"; the influence that God has over the hearts of men, and the effect he produces there are, hehath shined in our hearts.