"The Lord keeps His promises: 'I, the Lord, am bound when ye do what I say; but when ye do not what I say, ye have no promise' (D&C 82:10). We must do our part to qualify for the blessings (see D&C 130:20-22). We should also remember that God determines the then part according to His wisdom and not according to our expectations."

(Eternal Marriage, Student Manual)