His older self had taught his younger self a language which the older self knew because the younger self, after being taught, grew up to be the older self and was, therefore, capable of teaching.

Duty is a debt you owe to yourself to fulfill obligations you have assumed voluntarily.

Remember though, your best weapon is between your ears and under your scalp -provided it's loaded.

He never gave up his search for the Door into Summer.

It’s not enough to be able to lie with a straight face; anybody with enough gall to raise on a busted flush can do that. The first way to lie artistically is to tell the truth — but not all of it. The second way involves telling the truth, too, but is harder: Tell the exact truth and maybe all of it…but tell it so unconvincingly that your listener is sure you are lying.

Whores perform the same function as priests, but far more thoroughly.

The future is better than the past. Despite the crepe hangers, romanticists, and anti-intellectuals, the world steadily grows better because the human mind, applying itself to environment, makes it better. With hands ... with tools ... with horse sense and science and engineering.