It is characteristic of science that the full explanations are often seized in their essence by the percipient scientist long in advance of any possible proof.

The present aristocracy of western culture, at the very moment when it most clearly dominates the world, is being imitated rapidly and successfully in every eastern country.

The only way of learning the method of science is the long and bitter way of personal experience.

The human mind evolved always in the company of the human body, and of the animal body before it was human. The intricate connections of mind and body must exceed our imagination, as from our point of view we are peculiarly prevented from observing them.

A part of sexuality may go to research, and a much larger part must lead to aesthetic creation. The art of the future will, because of the very opportunities and materials it will have at its command, need an infinitely stronger formative impulse than it does now.

Published papers may omit important steps and the memory of men of science, even the greatest, is sadly fallible.

It is characteristic of science that the full explanations are often seized in their essence by the percipient scientist long in advance of any possible proof.