God said, "Let there be light," and there was light. (Gen 1:3)
There are serious implications in the first chapter of the Book of Genesis. This passage shows that when God speaks, it happens. Let us ponder on this "light." God has mastery over light and even with the absence of light, darkness. As we can see later in the creation, God separated night from day.
On the other hand, God likes us to see the light of day in our lives. Except for some trials and tribulations which He can give us for our purification, God likes us to be happy now and in the afterlife.