The life is a preparation for the future; and the best preparation for the future is live as if there were none.
Striving not to be a success, but rather a value.
Two things are infinite: human stupidity and the universe; and I'm not sure about the last one.
Whoever is careless with the truth in small matters cannot be trusted in important matters.
You don't really understand something unless you are able to explain it to your grandmother.