Aristotle said of Socrates that he invented the arts of definition and induction. But Socrates, we know, was not a teacher of logic; he was the investigator of ethical truth; and it was in the endeavour to satisfy a distinctively theological thirst that he smote the rocks at the foot of the Acropolis, and caused to gush forth there these crystalline headsprings of the scientific method. Unless we think boldly, north, south, east, and west, and syllogistically, and on our knees, we do not think at all. A Greek teacher of morals first taught us to think in this manner, and, as instruments of ethical research, invented definition and induction. The scientific method thus had a theological origin.