For every one billion particles of antimatter there were one billion and one particles of matter. And when the mutual annihilation was complete, one billionth remained - and that's our present universe.

Marvellous, what ideas the young people have these days. But I don't believe a word of it.

We can understand almost anything, but we can't understand how we understand.

Galileo - the father of modern physics - indeed of modern science.

Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.

Consider the concepts referred to in the words 'where', 'when', 'why', 'being', to the elucidation of which innumerable volumes of philosophy have been devoted. We fare no better in our speculations than a fish which should strive to become clear as to what is water.

So long as there are men, there will be wars.