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

The world can only be grasped by action, not by contemplation.

No science is immune to the infection of politics and the corruption of power.

There must be something unique about man because otherwise, evidently, the ducks would be lecturing about Konrad Lorenz, and the rats would be writing papers about B. F. Skinner.

Certainty ends inquiry.

Dream or nightmare, we have to live our experience as it is, and we have to live it awake. We live in a world which is penetrated through and through by science and which is both whole and real. We cannot turn it into a game simple by taking sides.

Man masters nature not by force but by understanding. This is why science has succeeded where magic failed: because it has looked for no spell to cast over nature.