“Each being is, exactly as you are, the sole centre of a Universe in no wise identical with, or even assimilable to, your own. The impersonal Universe of Nature is only an abstraction, approximately true, of the factors which it is convenient to regard as common to all. The Universe of another is therefore necessarily unknown to, and unknowable by, you; but it induces currents of energy in yours by determining in part your reactions. Use men and women, therefore, with the absolute respect due to inviolable standards of measurement; verify your own observations by comparison with similar judgements made by them; and, studying the methods which determine their failure or success, acquire for yourself the wit and skill required to cope with your own problems.”