Prayer is God's program. When we pray for other people, we are cooperating with God. We are teaming up with God to accomplish His work in the world.
Prayer is the way we make our requests to God. Prayer is God's chosen method of meeting your needs. The Bible teaches that there are some things that God has promised to do only if we pray.
Philippians 4:6 "Don't worry about anything but in everything, with your prayers and your supplications, make your requests known to God and the peace of God which passes all understanding will keep your hearts and your minds in Christ Jesus."
John 16:23-24 "I tell you the truth, the Father will give you whatever you ask in My name. Until now you have not asked for anything in My name. Ask and you will receive and your joy will be complete."