There may be no good reasons for very many opinions that are held with passion.

The greatest challenge to any thinker is stating the problem in a way that will allow a solution.

I know a parson who frightened his congregation terribly by telling them the second coming was very imminent indeed, but they were much consoled when they found he was planting trees in his garden.

The resistance to a new idea increases by the square of its importance.

We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.

Insight, untested and unsupported, is an uncertain guarantee of the truth.

Politics is concerned with herds rather than with individuals, and the passions which are important in politics are, therefore, those in which the various members of a given herd can feel alike.