When you propose ridiculous things to believe, too many men will choose to believe nothing at all.

The soul, like the body, accepts by practice whatever habit one wishes it to contact.

Serenity, regularity, absence of vanity,Sincerity, simplicity, veracity, equanimity, Fixity, non-irritability, adaptability, Humility, tenacity, integrity, nobility, magnanimity, charity, generosity, purity. Practise daily these eighteen "ities" You will soon attain immortality.

The first key to greatness is to be in reality what we appear to be.

Men of Athens, I honor and love you; but I shall obey God rather than you, and while I have life and strength I shall never cease from the practice and teaching of philosophy.

If the whole world depends on today's youth, I can't see the world lasting another 100 years.

I know what I do not know.