The preoccupation with the choice of a mate both by male and female I regard as a continuing echo of the major selective force by which we have evolved.

Science has nothing to be ashamed of even in the ruins of Nagasaki. The shame is theirs who appeal to other values than the human imaginative values which science has evolved.

All science is the search for unity in hidden likenesses.

The basis for poetry and scientific discovery is the ability to comprehend the unlike in the like and the like in the unlike.

Every judgment in science stands on the edge of error, and is personal.

It is important that students bring a certain ragamuffin, barefoot irreverence to their studies; they are not here to worship what is known, but to question it.

Satire is not a social dynamite. But it is a social indicator: it shows that new men are knocking at the door.