Man cannot survive except through his mind. He comes on earth unarmed. His brain is his only weapon. Animals obtain food by force. man had no claws, no fangs, no horns, no great strength of muscle. He must plant his food or hunt it. To plant, he needs a process of thought. To hunt, he needs weapons,and to make weapons - a process of thought. From this simplest necessity to the highest religious abstraction, from the wheel to the skyscraper, everything we are and we have comes from a single attribute of man -the function of his reasoning mind.

An irresponsible person is a person who makes vague promises, then breaks his word, blames it on circumstances and expects other people to forgive it.

I agree that [marriage] should be treated like a business deal. But every business deal has to have its own terms and its own kind of currency.

If you don't know, the thing to do is not to get scared, but to learn.

There are no contradictions. If you find one, check your premises.

Do not ever say that the desire to 'do good' by force is a good motive. Neither power-lust nor stupidity are good motives.

A society that robs an individual of the product of his effort, or enslaves him, or attempts to limit the freedom of his mind, or compels him to act against his own rational judgment-a society that sets up a conflict between its edicts and the requirements of man’s nature—is not, strictly speaking, a society, but a mob held together by institutionalized gang-rule.