If any man has done wrong, the harm is his own. But perhaps he has not done wrong.

As for literature, thefts cannot harm it, while the lapse of ages augments its value

Always follow these two rules: first, act only on what your reasoning mind proposes for the good of humanity, and second, change your opinion if someone shows you it's wrong. This change of mind must proceed only from the conviction that it's both correct and for the common good, but not because it will give you pleasure and make you popular.

Live out your life in truth and justice, tolerant of those who are neither true nor just.

External things are not the problem. It's your assessment of them. Which you can erase right now.

The perfection of moral character consists in this, in passing every day as the last, and in being neither violently excited nor torpid nor playing the hypocrite.

Bear in mind that the measure of a man is the worth of the things he cares about. If it is good to say or do something, then it is even better to be criticized for having said or done it.