In four ways ... should one who flatters be understood as a foe in the guise of a friend: He approves of his friend's evil deeds, he disapproves his friend's good deeds, he praises him in his presence, he speaks ill of him in his absence.
No greater wrong can ever be done than to put a good man at the mercy of a bad, while telling him not to defend himself or his fellows; in no way can the success of evil be made surer or quicker.
The evil implanted in man by nature spreads so imperceptibly, when the habit of wrong-doing is unchecked, that he himself can set no limit to his shamelessness.
You do not settle whether an argument is justified by merely showing that it is of some use. The distinction is not between useful and useless experiments but between barbarous and civilized behaviour. Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.
When an evil-doer, seeing you practise goodness, comes and maliciously insults you, you should patiently endure it and not feel angry with him, for the evil-doer is insulting himself by trying to insult you.
The Law is not in fault, but our evil and wicked nature; even as a heap of lime is still and quiet until water is poured on it, but then it begins to smoke and burn, not from the fault of the water, but from the nature of the lime, which will not endure it.
You would not easily guess All the modes of distress Which torture the tenants of earth; And the various evils, Which like so many devils, Attend the poor souls from their birth.