"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 

"stop seeking out the storms and enjoy more fully the sunlight"

"Criticism, faultfinding, evil speaking—these are of the spirit of our day. From many directions we are told that nowhere is there a man of integrity holding political office. Businessmen are crooks. Utilities are out to rob you. Everywhere is heard the snide remark, the sarcastic gibe, the cutting down of associates. Sadly, these are too often the essence of our conversation. In our homes, wives weep and children finally give up under the barrage of criticism leveled by husbands and fathers. Criticism is the forerunner of divorce, the cultivator of rebellion, sometimes a catalyst that leads to failure. In the Church it sows the seed of inactivity and finally apostasy.

"I am asking that we stop seeking out the storms and enjoy more fully the sunlight. I am suggesting that as we go through life we “accentuate the positive.” I am asking that we look a little deeper for the good, that we still voices of insult and sarcasm, that we more generously compliment virtue and effort. I am not asking that all criticism be silenced. Growth comes of correction. Strength comes of repentance. Wise is the man who can acknowledge mistakes pointed out by others and change his course.

"What I am suggesting is that each of us turn from the negativism that so permeates our society and look for the remarkable good among those with whom we associate, that we speak of one another’s virtues more than we speak of one another’s faults, that optimism replace pessimism, that our faith exceed our fears. When I was a young man and was prone to speak critically, my father would say: “Cynics do not contribute, skeptics do not create, doubters do not achieve.” "

- President Gordon B. Hinckley, First Counselor in the First Presidency, "The Continuing Pursuit of Truth," Ensign, April 1986. "This is an edited version of a talk President Hinckley delivered 18 June 1983 at the BYU—Hawaii commencement exercises."
https://www.lds.org/ensign/1986/04/the-continuing-pursuit-of-truth?lang=eng