You have to give God something to work with to win in spiritual warfare. Think of the boy who gave Jesus his lunch. Jesus adds to and multiplies what we give Him, but the devil subtracts and divides. Many times, we are so consumed with what we need from God that it never once crosses our mind what God wants from us. Could it be that giving something you already have is the key to what you are asking God for? There are no excuses with God when He is offering us everything in return.