Brigham Young said:

“If you feel evil, keep it to yourselves until you overcome that evil principle…. When you are influenced by the Spirit of holiness and purity, let your light shine….

For speaking produces fruit, either of a good or evil character… In all your social communications, or whatever your associations are, let all the dark, discontented, murmuring, unhappy miserable feelings, all the evil fruit of the mind, fall from the tree in silence and unnoticed; and so let it perish, without taking it up to present to your neighbors. 

But when you have joy and happiness, light and intelligence, truth and virtue, offer that fruit abundantly to your neighbors, and it will do them good, and so strengthen the hands of your fellow-beings….  (Journal of Discourses, 5:351-352)