Have I not commanded you? Be strong and of good courage; be not frightened, neither be dismayed; for the LORD your God is with you wherever you go.
Joshua had nothing but a rabble of ex-slaves helping him when he went to conquer the land of Canaan. The reason he could do it was because of five words: "Have I not commanded you?" Those words wouldn't mean much if they had been spoken by human beings. But they were spoken by God and God does not command what he does not mean to enable us to do. It's the same today as we face the tasks God commands us to do. He doesn't ask of us what he does not give us the power to do.