“The historian is not only a lover of truth, not only a chronicler of events. These, indeed, he must be at his peril, but how much more! Insight into human nature—and this implies the rarest knowledge and finest sympathy of which man is capable; the power of tracing the delicate relation between deed and motive, and the pressure of action upon circumstance and circumstance upon action; knowledge of the world, in short, in the highest sense of that expression.”