“Some of these questions at this stage appear to be unanswerable in the light of present scientific knowledge.”

In common parlance: `The more you know, the more you know you don’t know.

Evolution answers some questions but reveals many more questions.

Science cannot describe individuals, but only types. If human societies cannot be classified, they must remain inaccessible to scientific description.

It has been invariably my experience that I could count on his cooperation and sympathy in every matter concerning my scientific work.

The possibility of a scientific treatment of history means a wider experience, a greater maturity of practical reason, and finally a fuller realization of certain basic ideas regarding the nature of life and time.

The truth is that the religious and the scientific processes, though involving different methods, are identical in their final aim. Both aim at reaching the most real.

The possibility of observing the developments of the psychical life of the child as natural phenomena and experimental reactions transforms the school itself in action into a kind of scientific laboratory for the psychogenetic study of man.

A good novel is worth more than the best scientific study.

When I write a scientific treatise, I might reach 100 people. When the ‘National Geographic’ covers a project, it communicates about plants and fish and underwater technology to more than 10 million people.

Like tens of thousands of others, I have been a spectator of, rather than a participator in, the activities – political, commercial, sociological, scientific – of the times in which I have lived.