Those who have a natural talent for calculation are generally quick-witted at every other kind of knowledge; and even the dull, if they have had an arithmetical training, although they may derive no other advantage from it, always become much quicker than they would have been.

I know nothing more worthy of a man's ambition than that his son be the best of men.

To suffer the penalty of too much haste, which is too little speed.

When you swear, swear seriously and solemnly, but at the same time with a smile, for a smile is the twin sister of seriousness.

Seek truth while you are young, for if you do not, it will later escape your grasp

True friendship can exist only between equals.

The philosopher is in love with truth, that is, not with the changing world of sensation, which is the object of opinion, but with the unchanging reality which is the object of knowledge.