That which does no harm to the state, does no harm to the citizen. In the case of every appearance of harm apply this rule: if the state is not harmed by this, neither am I harmed. But if the state is harmed, thou must not be angry with him who does harm to the state. Show him where his error is.
Art thou angry with him whose armpits stink? Art thou angry with him whose mouth smells foul? What good will this danger do thee? He has such a mouth, he has such arm-pits: it is necessary that such an emanation must come from such things- but the man has reason, it will be said, and he is able, if he takes pain, to discover wherein he offends- I wish thee well of thy discovery. Well then, and thou hast reason: by thy rational faculty stir up his rational faculty; show him his error, admonish him. For if he listens, thou wilt cure him, and there is no need of anger. Neither tragic actor nor whore...
If any man is able to convince me and show me that I do not think or act right, I will gladly change; for I seek the truth by which no man was ever injured. But he is injured who abides in his error and ignorance.
When a man has done thee any wrong, immediately consider with what opinion about good or evil he has done wrong. For when thou hast seen this, thou wilt pity him, and wilt neither wonder nor be angry. For either thou thyself thinkest the same thing to be good that he does or another thing of the same kind. It is thy duty then to pardon him. But if thou dost not think such things to be good or evil, thou wilt more readily be well disposed to him who is in error.
The prime principle then in man's constitution is the social. And the second is not to yield to the persuasions of the body, for it is the peculiar office of the rational and intelligent motion to circumscribe itself, and never to be overpowered either by the motion of the senses or of the appetites, for both are animal; but the intelligent motion claims superiority and does not permit itself to be overpowered by the others. And with good reason, for it is formed by nature to use all of them. The third thing in the rational constitution is freedom from error and from deception. Let then the ruling principle holding fast to these things go straight on, and it has what is its own.
Remember that to change thy opinion and to follow him who corrects thy error is as consistent with freedom as it is to persist in thy error. For it is thy own, the activity which is exerted according to thy own movement and judgement, and indeed according to thy own understanding too.
If a man is mistaken, instruct him kindly and show him his error. But if thou art not able, blame thyself, or blame not even thyself.
When thou art offended at any man's fault, forthwith turn to thyself and reflect in what like manner thou dost err thyself; for example, in thinking that money is a good thing, or pleasure, or a bit of reputation, and the like. For by attending to this thou wilt quickly forget thy anger, if this consideration also is added, that the man is compelled: for what else could he do? or, if thou art able, take away from him the compulsion.