In the movie SHAWDOWHANDS, he was depicted reflecting on the nature of prayer. Asked why he prayed, he responded, "I pray because I can't help myself. I pray because the need flows out of me all the time, waking and sleeping. It doesn't change God; it changes me."
This is an unfair depiction in the movie. Most likely, C S Lewis did not say that.
When we pray, God listens and changes. He may change a lot, or change very little, but he changes. See the lesson in Luke 11:5-9, about the sleeping man who was moved to get up by persistent requests for bread.
When we pray, we also change ourselves. "It changes me". The airplane passengers prayed for safe journey, but the flight turned out to be disastrous. What happened would surely change how the passengers think.
Don't say "It doesn't change God". God the Father does consider our prayers - maybe not giving in to what was prayed for, but changes the outcome in other ways. God is good, always.
