"The wise man does not deprecate life nor does he fear the end of life."

"One must not pretend to philosophize, but really philosophize; for what we need is not the semblance of health, but real health."

"The study of nature creates men who are not only free from fear, but also from vanity."

"Of all the things which wisdom provides for the happiness of the whole life, by far the most important is the acquisition of friendship."

"The greatest disturbance of the soul is not pain, but the fear of pain."