From R.C. Sproul’s new book, The Prayer of Our Lord (p. 15):
You should remember who is being addressed and who is doing the speaking.
That is, the first thing you are to remember in prayer is who it is you’re talking to, because nothing will condition your prayer life more deeply than remembering that you’re in conversation with God, the sovereign Creator and ruler of the universe.
Second, you are to remember who you are. You are not God. You are a creature. So prayer is not a conversation between peers; it is not a fireside chat among equals. This is the creature speaking to his sovereign Creator.