The investigator in any field of knowledge must, as the price of success, both comprehend the general principles underlying his special problem, and give constant care to its details. Yet it is well, now and then, to leave details behind and consider the bearing of his work upon the science as a whole.

Congress of Arts and Science: Universal Exposition, St. Louis, 1904, Volume 4, The Problems of Astrophysics (p. 446)