Art is the most effective mode of communications that exists.

The best preparation for the future is a well-spent today.

But the individual butterfly or earthquake remains just the unique existence which it is. We forget in explaining its occurrence that it is only the occurrence that is explained, not the thing itself.

Every serious-minded person knows that a large part of the effort required in moral discipline consists in the courage needed to acknowledge the unpleasant consequences of one's past and present acts.

Collateral learning in the way of formation of enduring attitudes, of likes and dislikes, may be and often is much more important than the spelling lesson or lesson in geography or history that is learned.

If the members who compose a society lived on continuously, they might educate the new-born members, but it would be a task directed by personal interest rather than social need. Now it is a work of necessity.

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.