I’ve learned to love that song and when I ask mormons about it, most don’t have an answer outside of “The GA’s are responsible for the hymns that are included.”
Rock of Ages, no. 111
1. Rock of Ages, cleft for me,
Let me hide myself in thee;
Let the water and the blood,
From thy wounded side which flowed,
Be of sin the double cure,
Save from wrath and make me pure.
2. Not the labors of my hands
Can fill all thy laws demands;
Could my zeal no respite know,
Could my tears forever flow,
All for sin could not atone;
Thou must save, and thou alone.
3. While I draw this fleeting breath,
When mine eyes shall close in death,
When I rise to worlds unknown
And behold thee on thy throne,
Rock of Ages, cleft for me,
Let me hide myself in thee.
I think this one explains our view on salvation and grace. Not the labors of my hands can fill all thy laws demands; Thou must save, and thou alone. We teach that there are requirements in the law's demands, but those "works" will not fill ALL the law's demands. Only the grace of Christ gets me in to heaven. You explain it backwards from what we believe.
Because, apparently, in LDS doctrine, His grace is not sufficient.
No, in LDS doctrine, our works are not sufficient, only His grace is (but we still are required to do works).