Writer

Love is that condition in which the happiness of another person is essential to your own... Jealousy is a disease, love is a healthy condition. The immature mind often mistakes one for the other, or assumes that the greater the love, the greater the jealousy.

When any government, or any church for that matter, undertakes to say to its subjects, This you may not read, this you must not see, this you are forbidden to know, the end result is tyranny and oppression no matter how holy the motives.

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

You can have peace. Or you can have freedom. Don't ever count on having both at once.

The supreme irony of life is that hardly anyone gets out of it alive.

Theology is never any help; it is searching in a dark cellar at midnight for a black cat that isn't there. Theologians can persuade themselves of anything.

Sex without love is merely healthy exercise.

Yield to temptation. It may not pass your way again.

Jangan melumpuhkan anak-anak Anda dengan membuat hidup mereka mudah.

One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen.

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

Political tags - such as royalist, communist, democrat, populist, fascist, liberal, conservative, and so forth - are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire.

The difference between science and the fuzzy subjects is that science requires reasoning while those other subjects merely require scholarship.

I am free because I know that I alone am morally responsible for everything I do. I am free, no matter what rules surround me. If I find them tolerable, I tolerate them; if I find them too obnoxious, I break them. I am free because I know that I alone am morally responsible for everything I do.

One of the sanest, surest, and most generous joys of life comes from being happy over the good fortune of others.

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.

Never worry about theory as long as the machinery does what it's supposed to do.

One man's 'magic' is another man's engineering. 'Supernatural' is a null word.

It's an indulgence to sit in a room and discuss your beliefs as if they were a juicy piece of gossip.

To be matter-of-fact about the world is to blunder into fantasy - and dull fantasy at that, as the real world is strange and wonderful.