We Must Not Exercise Faith Lightly or Ask for Things That Are Improper

Doctrine and Covenants 8:10

10 Remember that without faith you can do nothing; therefore ask in faith. Trifle not with these things; do not ask for that which you ought not.

Elder Bruce R. McConkie wrote:

“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], 384.)