On the fourth day it was beginning to look a lot like earth. Though it did not emanate from the sun or moon, there was light and darkness on the very first day. It was not a light and darkness dependent on heavenly bodies in the not yet created sky, but one dependent on the light which burst forth from eternity. By the end of the fourth day, there were familiar things like sky, sea and dry land, vegetation plants yielding seeds, trees bearing fruit, and lights in the sky that ordered the seasons. Once again there was evening and morning and it was all good.
By the end of the fourth day it is obvious that God does not do the work of creation with one quick swoop of His hand. It is also obvious that the chaos of some formless dark void was not the primal essence of creation, but the eternal light. Only when that light broke forth was everything made that was made. (John 1:3). Chaos and darkness is not the primal matter of creation, but the eternal light which still shines forth bringing into visibility those things that have been invisible. Another not so noticeable thing is revealed to us as each day's work is completed. It is a Word which is said not only at the end of the fourth day, but other days as well. ""And God saw that it was good." (Genesis 1:18). Though the work of God was not done, what had been completed was good.
Here is a Word which reminds us of the importance of recognizing that unfinished work is not a sign of failure. It may simply be a sign that we recognize an order that does not require instant completion. We live too much according to deadlines and schedules which often takes us away from standing back and appreciating what we have accomplished in the time given to us. If our work is not a part of our life instead of all of it, our life is out of sync with the way of the Creator. On the fourth day we are reminded that it is not sin if some work started today is finished tomorrow.