When man is not properly trained, he is the most savage animal on the face of the globe.

All I really know is the extent of my own ignorance

The disposition of noble dogs is to be gentle with people they know and the opposite with those they don't know...How, then, can the dog be anything other than a lover of learning since it defines what's its own and what's alien.

Prefer diligence before idleness, unless you esteem rust above brightness.

Much sleep is not required by nature, either for our souls or bodies, or for the action in which they are concerned.

Between knowledge of what really exists and ignorance of what does not exist lies the domain of opinion. It is more obscure than knowledge, but clearer than ignorance.

Thinking and spoken discourse are the same thing, except that what we call thinking is, precisely, the inward dialogue carried on by the mind with itself without spoken sound.