Robert A. Heinlein

Criminals are never materially handicapped by such rules; the only effect is to disarm the peaceful citizen and put him fully at the mercy of the lawless. Such rules look very pretty on paper; in practice they are as foolish and footless as the attempt of the mice to bell the cat.

The future is better than the past. Despite the crepehangers, 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.

Writing is not necessarily something to be ashamed of — but do it in private and wash your hands afterwards.

Time is never a problem on the God level. Or space. Whatever needed to deceive you was provided. But no more than that. That is the conservative principle in art at the God level. While I can't do it, not being at that level, I have seen a lot of it done. A skillful Artist in shapes and appearances does no more than necessary to create His effect.

If you don't like yourself, you can't like other people.

There is no such thing as "social gambling." Either you are there to cut the other bloke's heart out and eat it — or you're a sucker. If you don't like this choice — don't gamble.

Don't ever become a pessimist, Ira; a pessimist is correct oftener than an optimist, but an optimist has more fun, and neither can stop the march of events.

I am not going to talk about religious beliefs, but about matters so obvious that it has gone out of style to mention them.
I believe in my neighbors.
I know their faults and I know that their virtues far outweigh their faults. Take Father Michael down our road a piece — I'm not of his creed, but I know the goodness and charity and lovingkindness that shine in his daily actions. I believe in Father Mike; if I'm in trouble, I'll go to him. My next-door neighbor is a veterinary doctor. Doc will get out of bed after a hard day to help a stray cat. No fee —  no prospect of a fee. I believe in Doc.

A fake fortuneteller can be tolerated. But an authentic soothsayer should be shot on sight. Cassandra did not get half the kicking around she deserved.

There are hidden contradictions in the minds of people who "love Nature" while deploring the "artificialities" with which "Man has spoiled 'Nature.'" The obvious contradiction lies in their choice of words, which imply that Man and his artifacts are not part of "Nature" — but beavers and their dams are. But the contradictions go deeper than this prima-facie absurdity. In declaring his love for a beaver dam (erected by beavers for beavers' purposes) and his hatred for dams erected by men (for the purposes of men) the Naturist reveals his hatred for his own race — i.e., his own self-hatred.
In the case of "Naturists" such self-hatred is understandable; they are such a sorry lot. But hatred is too strong an emotion to feel toward them; pity and contempt are the most they rate.
As for me, willy-nilly I am a man, not a beaver, and H. sapiens is the only race I have or can have. Fortunately for me, I like being part of a race made up of men and women — it strikes me as a fine arrangement — and perfectly "natural" Believe it or not, there were "Naturists" who opposed the first flight to old Earth's Moon as being "unnatural" and a "despoiling of Nature."

Be wary of strong drink. It can make you shoot at tax collectors — and miss.

Money is the sincerest of all flattery. Women love to be flattered. So do men.

I now define "moral behavior" as "behavior that tends toward survival." I won't argue with philosophers or theologians who choose to use the word "moral" to mean something else, but I do not think anyone can define "behavior that tends toward extinction" as being "moral" without stretching the word "moral" all out of shape.

History has the relation to truth that theology has to religion — i.e., none to speak of.

I don't trust a man who talks about ethics when he is picking my pocket. But if he is acting in his own self-interest and says so, I have usually been able to work out some way to do business with him.

One can judge from experiment, or one can blindly accept authority. To the scientific mind, experimental proof is all important and theory is merely a convenience in description, to be junked when it no longer fits. To the academic mind, authority is everything and facts are junked when they do not fit theory laid down by authority.

“Die trying” is the proudest human thing.

What are the facts? Again and again and again — what are the facts? Shun wishful thinking, ignore divine revelation, forget what "the stars foretell," avoid opinion, care not what the neighbors think, never mind the unguessable "verdict of history" — what are the facts, and to how many decimal places? You pilot always into an unknown future; facts are your single clue. Get the facts!

Rub her feet.

There has grown up in the minds of certain groups in this country the notion that because a man or corporation has made a profit out of the public for a number of years, the government and the courts are charged with the duty of guaranteeing such profit in the future, even in the face of changing circumstances and contrary to public interest. This strange doctrine is not supported by statute or common law. Neither individuals nor corporations have any right to come into court and ask that the clock of history be stopped, or turned back.