It is part of "man's chief end" not only to know Nature - which is Science, but to enjoy her forever. We are men of feeling, and Nature speaks to our heart, though we are not fond, unless we are poets, of saying much about it. But we listen with gladness, with awe, sometimes, perhaps, with fear, surely always with wonder.

Introduction to Science, Chapter VI (pp. 169-170), Henry Holt & Co. 1911