What are the three answers God can give to prayer?

Les explains that in the verse under discussion, all three of God's answers to prayer are evident. He asks what kind of answer you expect when you pray, not an audible voice, but practically: yes or no? Then he illustrates with a child asking a parent for something—sometimes the answer is 'when you get a little older,' meaning later. He also connects prayer to God's foreknowledge: we don't change God's mind, but He has already planned everything according to the fact that we will pray. So God can answer yes, no, or later, all within His sovereign will.