Two thoughts on prayer:

"The practical problem about charity (in one’s prayer) is very hard work, isn’t it? When you pray for Hitler and Stalin how do you actually teach yourself to make the prayer real? The two things that help me are (a) A continual grasp of the idea that one is only joining one’s feeble little voice to the perpetual intercession of Christ who died for these very men. (b) A recollection, as firm as I can make it, of all one’s own cruelty; what might have blossomed under different conditions into something terrible. You and I are not at bottom so different from these ghastly creatures." (from Letters of CS Lewis, 1940)

"Meanwhile, little people like you and me, if our prayers are sometimes granted, beyond all hope and probability, had better not draw hasty conclusions to our own advantage. If we were stronger, we might be less tenderly treated. If we were braver, we might be sent, with far less help, to defend far more desperate posts in the great battle." (from "The Efficacy of Prayer" by C.S. Lewis)