Prayer is action you take in order to realize yourself fully with your neighbor and with God. It is the fulfillment of the great commandment to love God and neighbor. It opens the gate to heaven; heaven is the complete recognition of your potential to be who you really are, uniting you in pain and joy with God and with the whole world. Embracing your own alienation and brokenness with honesty and openness is the foundation of prayer; prayer can be choked off by self-will. Prayer is anything you think, say, do, or feel that opens you up and out to love.
Look at this window: it is nothing but a hole in the wall, but because of it the whole room is full of light. So when the faculties are empty, the heart is full of light. Being full of light it becomes an influence by which others are secretly transformed.