I see several animals that live so entire and perfect a life, some without sight, others without hearing: who knows whether to us also one, two, or three, or many other senses, may not be wanting?

A father is very miserable who has no other hold on his children's affection than the need they have of his assistance, if that can be called affection.

To philosophize is to learn to die.

Their pupils and their little charges are not nourished and fed by what they learn: the learning is passed from hand to hand with only one end in view: to show it off, to put into our accounts to entertain others with it, as though it were merely counters, useful for totting up and producing statements, but having no other use or currency. 'Apud alios loqui didicerunt, non ipsi secum' [They have learned how to talk with others, not with themselves]

It is equally pointless to weep because we won't be alive a hundred years from now as that we were not here a hundred years ago.

When a Roman was returning from a trip, he used to send someone ahead to let his wife know, so as not to surprise her in the act.

Socrates and then Archesilaus used to make their pupils speak first; they spoke afterwards. 'Obest plerumque iss discere volunt authoritas eorum qui docent.' [For those who want to learn, the obstacle can often be the authority of those who teach]