Temper

"Men are like steel — when they lose their temper, they lose their worth."

"Through certain humors or passions, and from temper merely, a man may be completely miserable, let his outward circumstances be ever so fortunate."

"Good temper, like a sunny day, sheds a brightness over everything; it is the sweetener of toil and the soother of disquietude."

"The happiness and misery of men depend no less on temper than fortune."

"A man of knowledge uses words with restraint, and a man of understanding is even-tempered."

"When you see anyone complaining of such and such a person's ill-nature and bad temper, know that the complainant is bad-tempered, forasmuch as he speaks ill of that bad-tempered person, because he alone is good-tempered who is quietly forbearing towards the bad-tempered and ill-natured."

"Courtesy of temper, when it is used to veil churlishness of deed, is but a knight's girdle around the breast of a base clown."