Whether you know the shape of a pebble or the structure of a solar system, the anxioms remain the same: that it exists and that you know it.

I would give the greatest sunset in the world for one sight of New York's skyline.

This god, this one word: I.

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.

Rationality is the recognition of the fact that nothing can alter the truth and nothing can take precedence over that act of perceiving it.

You have no choice about your capacity to feel that something is good for you or evil, but what you will consider good or evil, what will give you joy or pain, what you will love or hate, desire or fear, depends on your standard of value.

The fact that a man has no claim on others ... does not preclude or prohibit good will among men and does not make it immoral to offer or to accept voluntary, non-sacrificial assistance.