The great business of man is to improve his mind, and govern his manners; all other projects and pursuits, whether in our power to compass or not, are only amusements.
The brain is the highest of the organs in position, and it is protected by the vault of the head; it has no flesh or blood or refuse. It is the citadel of sense-perception.
Indeed, what is there that does not appear marvelous when it comes to our knowledge for the first time? How many things, too, are looked up on as quite impossible until they have been actually effected?
Man is the only one that knows nothing, that can learn nothing without being taught. He can neither speak nor walk nor eat, and in short he can do nothing at the prompting of nature only, but weep.
