Until politics are a branch of science, we shall do well to regard political and social reforms as experiments rather than short-cuts to the millennium.

I will jump into the river to save two brothers or eight cousins.

I do not believe in the commercial possibility of induced radioactivity.

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.

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

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

The conclusion forced upon me in the course of a life devoted to natural science is that the universe as it is assumed to be in physical science is only an idealized world, while the real universe is the spiritual universe in which spiritual values count for everything.