Epicurus — "The wise man is happy even on the rack."

"The flesh cries out to not be hungry, thirsty, or cold. Anyone who has these things, and good hope of keeping them, might rival even Zeus in happiness."

"The just man is most free from disturbance, while the unjust is full of the utmost disturbance."

"Empty is the argument of the philosopher by which no human suffering is therapeutically treated."

"Let no one when young delay to study philosophy, nor when old grow weary of studying it. For no one is either too early or too late for the health of the soul."

"We are born once and cannot be born twice, but for all eternity must be no more. But you, who are not master of tomorrow, postpone your happiness. Life is wasted by delaying, and each one of us dies w…"