This is another important lesson. God responds to passionate cries for His deliverance and for His will to be done. There is a tremendous power to passionate prayer. All through the Bible, and particularly in the ministry of the Messiah, we see how passionate people, and passionate prayers moved God to action. When Moses was ready, He had a life changing revelation and was given a divine commission.
Revelation always brings with it a commission.
God always reveals Himself for a purpose. Everybody has a particular calling to fulfill, a mission to accomplish. Your assignment will probably sound to you like Moses' sounded to Him, impossible. You will probably respond, or may already have, like Moses did, with excuse making about your inabilities, weaknesses and insecurities. If God gave you a mission to fulfill that you could do in your natural strength, you would not need God, and that wouldn't be much fun for God.