Don't be a fault-finding grouch; when you feel like finding fault with somebody or something stop for a moment and think; there is very apt to be something wrong within yourself. Don't permit yourself to show temper, and always remember that when you are in the right, you can afford to keep your temper, and when you are in the wrong you cannot afford to lose it.
To be angry about trifles is mean and childish; to rage and be furious is brutish; and to maintain perpetual wrath is akin to the practice and temper of devils; but to prevent and suppress rising resentment is wise and glorious, is manly and divine.
Discreetly keep most of your radical opinions to yourself. When with people be a listener a large part of the time. Be considerate in every word and act, and resist the tendency to say clever things. The best evidence of your culture is the tone and temper of your conversation.
If a man does not control his temper, it is a sad admission that he is not in control of his thoughts. He then becomes a victim of his own passions and emotions, which lead him to actions that are totally unfit for civilized behavior, let alone behavior for a priesthood holder.
A man in such a mental state that the anger itself does him more harm than the condition which aroused his anger . . . suffers more from the vexation than he does from the acts that aroused that vexation. I wonder how long it will take us to realize that in matters of temper nothing can bring us damage but ourselves.
David McKay (1873 - 1970)
Source: Address, Brigham Young University, October 12, 1965.