When we pray, we must believe that God will hear and answer prayer.
"He that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him."
(Hebrews 11:6b)
When we pray in faith, we must believe that God will grant that for which we have prayed.
"Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them." (Mark 11:24)
Shouldn't we be submissive to God's will when we pray? Yes, but so often the term "If it is Your will," is used as a cop-out, as a way of saying, "Well, if I say this when I pray, and it doesn't happen then it was God's will for it not to happen and I'll accept it," meanwhile not expecting all along for God to give what is asked for.
What if we ask something that is not God's will? God will reveal that. The Apostle Paul spent time in prayer on three occasions asking God to heal him. It was not until after the third time that God revealed to Paul that healing him was not God's will. But God did not just say "No." God also revealed to Paul what His will was. "My grace is sufficient for thee: for my strength is made perfect in weakness." (II Corinthians 12:9b). Now Paul could redirect his prayer and ask for God's grace and power to be revealed through Paul's weakness.
Turn Again to the Lord