  An ancient view still popular today is that moral knowledge must ultimately be based on the will or commandments of the Creator. This view faces two major problems. First, there is the obvious difficulty that skepticism about God’s existence is at least as difficult to lay to rest as skepticism about moral knowledge. Since arguments for and against the existence of God are assessed elsewhere in this Encyclopedia, I will not stop to rehearse them here. Second, there is the further difficulty that even if we are confident about God’s existence, it is not clear how we can interpret the will or commandments of God without first having moral knowledge, thus making this reply to the skeptic question-begging.