3 Nephi 18:20

“Whatsoever ye shall ask . . . shall be given unto you.”

20 And whatsoever ye shall ask the Father in my name, which is right, believing that ye shall receive, behold it shall be given unto you.

Elder Bruce R. McConkie wrote:

“In the pure and perfect and proper sense, no one can speak or pray in the name of Christ unless he speaks or prays by the power of the Holy Ghost. It is within our capability, as the Lord’s people, to do this because ‘we have the mind of Christ’ (1 Corinthians 2:16). . . . Perfect prayers are always answered; proper petitions are always granted. The Lord never rejects a prayer uttered by the power of the Spirit, or denies a petition sought in the name of Christ, that accords with the divine will.”

(A New Witness for the Articles of Faith [1985], 383–84.)