I like people. I like animals, too-whales and quail, dinosaurs and dodos. But I like human beings especially, and I am unhappy that the pool of human germ plasm, which determines the nature of the human race, is deteriorating.

[Instead of collecting stamps, he collected dictionaries and encyclopaedias:] Because you can learn more from them.

If you want to have good ideas you must have many ideas.

The way to get good ideas is to get lots of ideas and throw the bad ones away.

Every aspect of the world today - even politics and international relations - is affected by chemistry.

Men will gather knowledge no matter what the consequences. Science will go on whether we are pessimistic or optimistic, as I am. More interesting discoveries than we can imagine will be made, and I am awaiting them, full of curiosity and enthusiasm.

Does the commandment 'Thou Shalt Not Kill' mean nothing to us? Are we to interpret it as meaning 'Thou shalt not kill except on the grand scale,' or 'Thou shalt not kill except when the national leaders say to do so'?