“Blessed are the merciful.”

3 Nephi 12:7

7 And blessed are the merciful, for they shall obtain mercy.

President Harold B. Lee said:

“Our salvation rests upon the mercy we show to others. Unkind and cruel words, or wanton acts of cruelty toward man or beast, even though in seeming retaliation, disqualify the perpetrator in his claims for mercy when he has need of mercy in the day of judgment before earthly or heavenly tribunals.”

(Teachings of Presidents of the Church: Harold B. Lee [2000], 203.)