We must pray in His will. The fact is, God cannot answer prayer that is not in His will. It would be contrary to His omniscience, and of real harm to our lives.
So, it is of the very greatest importance to fashion our prayers to conform to His will and purpose.
After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name. 10 Thy kingdom come. Thy will be done in earth, as it is in heaven. Matthew 6:9-10 KJV