Nature is the armory of genius. Cities serve it poorly, books and colleges at second hand; the eye craves the spectacle of the horizon; of mountain, ocean, river and plain, the clouds and stars; actual contact with the elements, sympathy with the seasons as they rise and roll.

Yet the deepest truths are best read between the lines, and, for the most part, refuse to be written.

Observation more than books and experience more than persons, are the prime educators.

The true teacher defends his pupils against his own personal influence. He inspires self-trust. He guides their eyes from himself to the spirit that quickens him. He will have no disciples.