Let us be cautious in making assertions and critical in examining them, but tolerant in permitting linguistic forms.

Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientific, pseudo problems.

In logic, there are no morals.

In science there are no 'depths'; there is surface everywhere.

Anything you can do, I can do meta

Metaphysicians are musicians without musical ability.

It is indeed a surprising and fortunate fact that nature can be expressed by relatively low-order mathematical functions.

Let us be cautious in making assertions and critical in examining them, but tolerant in permitting linguistic forms.[Carnap’s famous plea for tolerance to which W.V. Quine took exception.]

History is a hammock for swinging and a game for playing.

You cannot be responsible for some things that happen on earth. You may attempt to act, God alone will decide. Some things are mysteries!

You can contol nothing but your own thoughts, but with your thoughts you can control the whole world.

But it does move.

There's only one thing left here to say. Love's never too late.

We've got to cut the extraneous out of our lives, and we've got to learn to stem the inflow. We need to think before we buy. Ask ourselves, 'Is that really going to make me happier? Truly?'

I once asked a policeman how far it was to the subway. he said, "I don't know, no one has ever made it".

Life must be filled up, and the man who is not capable of intellectual pleasures must content himself with such as his senses can afford.

Progress and growth are impossible if you always do things the way you've always done things.