The effectual, fervent prayer of a righteous man availeth much. To pray according to his Will is to ask for those things which He has said in his Word that He is willing to grant. Not my will, but thine be done. Prayer is not to bring God on board with our plans and desires. It is not to inform God of the problem and tell Him how to fix it. The less of self that is involved in our prayers, the more effectual our prayers will be. To pray according to his will is impossible unless we are walking with God in righteousness. If we regard iniquity in our heart, God will not hear our prayer. (Psalm 66:18)