It is not only orthodox history, of the school of Ranke, of which Thucydides is the father and inspirer: there is not one of the many movements which have sought to broaden out historical study in recent years, from Buckle and Leplay and Vidal de la Blache down to the psycho-analysts of our own day and of to-morrow who will not find in Thucydides some gleaming anticipation along the path of their own thought.

Here we touch upon what is perhaps the cardinal merit of the Greek political thinkers, as it is of the Greek contribution as a whole. They saw all the problems: but saw each in its place within the larger whole. They saw life steadily and saw it whole.

From A. Zimmern, Ancient Greek Political Thinking