Such words as "society" and "community" are likely to be misleading, for they have a tendency to make us think there is a single thing corresponding to the single word.

Old ideas give way slowly; for they are more than abstract logical forms and categories. They are habits, predispositions, deeply ingrained attitudes of aversion and preference.

The primary ineluctable facts of the birth and death of each one of the constituent members in a social group determine the necessity of education.

An idea is a method of evading, circumventing or surmounting through reflection, obstacles that otherwise would have to be attacked by brute force.

Giving and taking of orders modifies actions and results, but does not of itself effect a sharing of purposes, a communication of interests.

Knowledge falters when imagination clips its wings or fears to use them.

Scientific principles and laws do not lie on the surface of nature. They are hidden, and must be wrested from nature by an active and elaborate technique of inquiry.