There comes a time when the world gets quiet and the only thing left is your own heart. So you'd better learn the sound of it. Otherwise you'll never understand what it's saying.
In prayer we are neither on the one hand dialoguing with an outside source who utters messages from without, nor are we simply talking to ourselves. We are reaching deeply into ourselves and sensing more clearly that we are in God's knowledge and love. We are discovering the Divine within us. We are experiencing ourselves and our lives as uttered by God, and we listen.