Science may set limits to knowledge, but should not set limits to imagination.

The problem with the wise is they are so filled with doubts while the dull are so certain.

There is... in our day, a powerful antidote to nonsense, which hardly existed in earlier times - I mean science. Science cannot be ignored or rejected, because it is bound up with modern technique; it is essential alike to prosperity in peace and to victory in war. That is, perhaps from an intellectual point of view, the most hopeful feature of our age, and the one which makes it most likely that we shall escape complete submersion in some new or old superstition.

It can be shown that a mathematical web of some kind can be woven about any universe containing several objects. The fact that our universe lends itself to mathematical treatment is not a fact of any great philosophical significance.

When I was a child . . . Only virtue was prized, virtue at the expense of intellect, health, happiness, and every mundane good.

If there were in the world today any large number of people who desired their own happiness more than they desired the unhappiness of others, we could have a paradise in a few years.

We ought to look the world frankly in the face.