The bells which toll for mankind are - most of them, anyway - like the bells of Alpine cattle; they are attached to our own necks, and it must be our fault if they do not make a cheerful and harmonious sound.

Today the world changes so quickly that in growing up we take leave not just of youth but of the world we were young in.

I do not propose to criticize the fatuous argument I have just outlined; here, to expound is to expose.

If politics is the art of the possible, research is surely the art of the soluble. Both are immensely practical-minded affairs.

I reckon that for all the use it has been to science about four-fifths of my time has been wasted, and I believe this to be the common lot of people who are not merely playing follow-my-leader in research.

The alternative to thinking in evolutionary terms is not to think at all.

Scientists who think science consists of unprejudiced data-gathering without speculation are merely cows grazing on the pasture of knowledge.