When malice is joined to envy, there is given forth poisonous and feculent matter, as ink from the cuttle-fish.
PlutarchNo man ever wetted clay and then left it, as if there would be bricks by chance and fortune.
PlutarchIt is the admirer of himself, and not the admirer of virtue, that thinks himself superior to others.
PlutarchSo also it is good not always to make a friend of the person who is expert in twining himself around us; but, after testing them, to attach ourselves to those who are worthy of our affection and likely to be serviceable to us.
Plutarch