Man armed with science is like a baby with a box of matches.

A time will however come (as I believe) when physiology will invade and destroy mathematical physics, as the latter has destroyed geometry.

Science is vastly more stimulating to the imagination than the classics.

There is no great invention, from fire to flying, which has not been hailed as an insult to some god.

It was a reaction from the old idea of "protoplasm", a name which was a mere repository of ignorance.

I will give up my belief in evolution if someone finds a fossil rabbit in the Precambrian.

The future will be no primrose path. It will have its own problems. Some will be the secular problems of the past, giant flowers of evil blossoming at last to their own destruction. Others will be wholly new.