Vigorous societies harbour a certain extravagance of objectives.

Education is the acquisition of the art of the utilisation of knowledge.

Each human being is a more complex structure than any social system to which he belongs.

No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.

The only use of a knowledge of the past is to equip us for the present. The present contains all that there is. It is holy ground; for it is the past, and it is the future.

Each generation criticizes the unconscious assumptions made by its parent. It may assent to them, but it brings them out in the open.