On Tranquility of the Mind

"We are all chained to fortune: the chain of one is made of gold, and wide, while that of another is short and rusty. But what difference does it make? The same prison surrounds all of us, and even those who have bound others are bound themselves; unless perchance you think that a chain on the left side is lighter. Honors bind one man, wealth another; nobility oppresses some, humility others; some are held in subjection by an external power, while others obey the tyrant within; banishments keep some in one place, the priesthood others. All life is slavery. Therefore, each one must accustom himself to his own condition and complain about it as little as possible, and lay hold of whatever good is to be found near him... Apply reason to difficulties; harsh circumstances can be softened, narrow limits can be widened, and burdensome things can be made to press less severely on those who bear them cleverly."

~ Lucius Annaeus Seneca, On Tranquility of the Mind (A letter to Serenus as translated in Tranquility of Mind and Providence by William Bell Langsdorf)