Errors of knowledge are not breaches of morality; no proper moral code can demand infallibility or omniscience.

Happiness is a state of non-contradictory joy--a joy without penalty or guilt, a joy that does not clash with any of your values and does not work for your own destruction, not the joy of escaping from your mind, but of using your mind's fullest power, not the joy of faking reality, but of achieving values that are real, not the joy of a drunkard, but of a producer.

Remember that rights are moral principles which define and protect a man's freedom of action, but impose no obligations on other men.

A government is the most dangerous threat to man

No advocate of reason can claim the right to force his ideas on others. No advocate of the free mind can claim the right to force the minds of others. No rational society, no co-operation, no agreement, no understanding, no discussion are possible among men who propose to substitute guns for rational persuasion.

Whenever destroyers appear among men, they start by destroying money, for money is men's protection, and the base of a moral existence.

You don't love causes. You don't love everybody indiscriminately. You love only those who deserve it.