Prayer does not condition God; prayer conditions us.  Prayer does not win God to our view; it reveals God’s view to us.

From Colossians 4:2-4:  “Devote yourselves to prayer, keeping alert in it with thanksgiving.  At the same time, pray for us as well, that God will open to us a door for the word, that we may declare the mystery of Christ, for which I am in prison, so that I may reveal it clearly, as I should.“

Leonard Ravenhill (1907-1994) was a British Christian author.  Many of his chosen themes focused on prayer and revival.