A man who prays can spiritually afford to be generous. He can afford to let others have the last word. He can afford to appear inferior in argument. Abram knew that God would take care of him regardless, so he could afford to be generous.

Jesus taught His disciples to say when praying, "Our Father which art in heaven, Hallowed be thy name. Thy kingdom come. Thy will be done in earth, as it is in heaven." Now, if angels in heaven sinned, then God's will was not done in heaven.