What is the Handmaiden of Tolerance?

What is the handmaiden of tolerance?
But the ultimate virtue of love
Balanced together there's expectance
That each will be guided by truths from above

And as it is said the truth shall make you free
We are proved of whether or not we are the Lord's
For it is not just love and tolerance but unity
As towards repentance a rebuke or chastening affords

Dallin H. Oaks
Our Strengths Can Become Our Downfall-
Misapplication of Love and Tolerance
Ensign, October 1994, 11

D&C 95:1
Verily, thus saith the Lord unto you whom I love, and whom I love I also chasten that their sins may be forgiven, for with the chastisement I prepare a way for their deliverance in all things out of temptation, and I have loved you—