"no misfortune is so bad that whining about it won’t make it worse"

"I love what Elder Orson F. Whitney once said: “The spirit of the gospel is optimistic; it trusts in God and looks on the bright side of things. The opposite or pessimistic spirit drags men down and away from God, looks on the dark side, murmurs, complains, and is slow to yield obedience.” 6 We should honor the Savior’s declaration to “be of good cheer.” 7 (Indeed, it seems to me we may be more guilty of breaking that commandment than almost any other!) Speak hopefully. Speak encouragingly, including about yourself. Try not to complain and moan incessantly. As someone once said, “Even in the golden age of civilization someone undoubtedly grumbled that everything looked too yellow.”

"I have often thought that Nephi’s being bound with cords and beaten by rods must have been more tolerable to him than listening to Laman and Lemuel’s constant murmuring. 8 Surely he must have said at least once, “Hit me one more time. I can still hear you.” Yes, life has its problems, and yes, there are negative things to face, but please accept one of Elder Holland’s maxims for living—no misfortune is so bad that whining about it won’t make it worse."

- Elder Jeffrey R. Holland, Of the Quorum of the Twelve Apostles, "The Tongue of Angels," Ensign, May 2007
https://www.lds.org/ensign/2007/05/the-tongue-of-angels?lang=eng