During the US civil war Abraham Lincoln met with a group of ministers for a prayer breakfast. Lincoln was not a church-goer but was a man of deep, if at times unorthodox, faith. At one point one of the ministers said, “Mr President, let us pray that God is on our side”. Lincoln’s response showed far greater insight, “No, gentlemen, let us pray that we are on God’s side.”
Lincoln reminded those ministers that religion is not a tool by which we get God to do what we want but an invitation to open ourselves to being and doing what God wants.
Source: this is a widely distributed anecdote found on the internet, including citation in serious studies. I have been unable to confirm its historicity