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.

The honour of parents is a fair and noble treasure to their posterity, but to have the use of a treasure of wealth and honour, and to leave none to your successors, because you have neither money nor reputation of your own, is alike base and dishonourable.

Madness is a divine release of the soul from the yoke of custom and convention.

Let no one ignorant of Mathematics enter here.

Wealth and poverty; one is the parent of luxury and indolence, and the other of meanness and viciousness, and both of discontent.

Man's greatest victory is over oneself.

Until philosophers rule as kings or those who are now called kings and leading men genuinely and adequately philosophise, that is, until political power and philosophy entirely coincide, while the many natures who at present pursue either one exclusively are forcibly prevented from doing so, cities will have no rest from evils,... nor, I think, will the human race.