It was, I imagine, following out this principle that Democritus taught that "he who would live at peace must not do much business either public or private," referring of course to unnecessary business: for if there be any necessity for it we ought to transact not only much but endless business, both public and private; in cases, however, where no solemn duty invites us to act, we had better keep ourselves quiet: for he who does many things often puts himself in Fortune's power, and it is safest not to tempt her often, but always to remember her existence, and never to promise oneself anything on her security. I will set sail unless anything happens to prevent me, I shall be praetor, if nothing hinders me, my financial operations will succeed, unless anything goes wrong with them. This is why we say that nothing befalls the wise man which he did not expect—we do not make him exempt from the chances of human life, but from its mistakes, nor does everything happen to him as he wished it would, but as he thought it would: now his first thought was that his purpose might meet with some resistance, and the pain of disappointed wishes must affect a man's mind less severely if he has not been at all events confident of success.