Refuse to be ill. Never tell people you are ill; never own it to yourself. Illness is one of those things which a man should resist on principle.
The brain is a wonderful organ. It starts working the moment you get up in the morning and does not stop until you get into the office.
Whatever you do, do it to the purpose; do it thoroughly, not superficially. Go to the bottom of things. Any thing half done, or half known, is in my mind, neither done nor known at all. Nay, worse, for it often misleads.
The crux... is that the vast majority of the mass of the universe seems to be missing.
There is only one success - to be able to spend your life in your own way.
When we are unhurried and wise, we perceive that only great and worthy things have any permanent and absolute existence, that petty fears and petty pleasures are but the shadow of the reality.
Act as if it were impossible to fail.