And all saints who remember to keep and do these sayings,  walking in obedience to the commandments, shall receive health in their naval and marrow to their bones;

And shall find wisdom and great treasures of knowledge, even hidden treasures;

And shall run and not be weary, and shall walk and not faint.   And I, the Lord, give unto them a promise, that the destroying angel shall pass by them, as the children of Israel, and not slay them.   Amen.

D&C 89:18-21

The lord keeps his promises.