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]

Cowardice is the mother of cruelty.

Even opinion is of force enough to make itself to be espoused at the expense of life.

I quote others in order to better express myself.

No man is exempt from saying silly things; the mischief is to say them deliberately.

Our zeal works wonders, whenever it supports our inclination toward hatred, cruelty, ambition.

No man is so exquisitely honest or upright in living, but that ten times in his life he might not lawfully be hanged.