“Those who promise us paradise on earth never produced anything but hell.”

The way of science is paved with discarded theories that were once declared self-evident.

The method of learning by trial and error – of learning from our mistakes – seems to be fundamentally the same whether it is practiced by lower or by higher animals, by chimpanzees, or by men of science.

In philosophy methods are unimportant; any method is legitimate if it leads to results capable of being rationally discussed.

In so far as a scientific statement speaks about reality, it must be falsifiable: and in so far as it is not falsifiable, it does not speak about reality.

Theology, I still think, is due to a lack of faith.

Science may be described as the art of systematic oversimplification.

The game of science is, in principle, without end.

The essential feature of dualist-interactionism is that the mind and brain are independent entities and that they interact by quantum physics.

“It can’t happen here” is always wrong: a dictatorship can happen anywhere.

A theory that explains everything, explains nothing.

If our civilization is to survive, we must break with the habit of deference to great men.

The simple truth is that truth is hard to come by, and that once found may easily be lost again.

The quest for precision is analogous to the quest for certainty, and both should be abandoned.

Every intellectual has a very special responsibility. He has the privilege and the opportunity of studying.

The aim of argument, or of discussion, should not be victory but progress.

If you can’t say it simply and clearly, keep quiet, and keep working on it till you can.

I would have followed you to hell and back if only you’d lead me back.

I am dirty, Milena, endlessly dirty, that is why I make such a fuss about cleanliness. None sing as purely as those in deepest hell; it is their singing we take for the singing of angels.

Hell hath no fury like a liberal scorned.

Oh, I was not made for heaven. No, I don’t want to go to heaven. Hell is much better. Think of all the interesting people you’re going to meet down there.

I also think it is important for women to help one another. I have a saying: There is a special place in hell for women who don’t.

To every man is given the key to the gates of heaven. The same key opens the gates of hell.

Hell is – other people!

You go to Heaven once you’ve been to Hell.