At the same time, it must be acknowledged that too exclusive a devotion to imaginative and philosophical literature, especially if prolonged in life until the habits become formed, does to a great extent incapacitate a man for the business of practical life. Speculative ability is one thing, and practical ability another; and the man who, in his study, or with his pen in hand, shows himself capable of forming large views of life and policy, may, in the outer world, be found altogether unfitted for carrying them into practical effect. Speculative ability depends on vigorous thinking--practical ability on vigorous acting; and the two qualities are usually found combined in very unequal proportions. The speculative man is prone to indecision: he sees all the sides of a question, and his action becomes suspended in nicely weighing the pros and cons, which are often found pretty nearly to balance each other; whereas the practical man overleaps logical preliminaries, arrives at certain definite convictions, and proceeds forthwith to carry his policy into action. [1323] Yet there have been many great men of science who have proved efficient men of business. We do not learn that Sir Isaac Newton made a worse Master of the Mint because he was the greatest of philosophers. Nor were there any complaints as to the efficiency of Sir John Herschel, who held the same office. The brothers Humboldt were alike capable men in all that they undertook--whether it was literature, philosophy, mining, philology, diplomacy, or statesmanship. Niebuhr, the historian, was distinguished for his energy and success as a man of business. He proved so efficient as secretary and accountant to the African consulate, to which he had been appointed by the Danish Government, that he was afterwards selected as one of the commissioners to manage the national finances; and he quitted that office to undertake the joint directorship of a bank at Berlin. It was in the midst of his business occupations that he found time to study Roman history, to master the Arabic, Russian, and other Sclavonic languages, and to build up the great reputation as an author by which he is now chiefly remembered. Having regard to the views professed by the First Napoleon as to men of science, it was to have been expected that he would endeavour to strengthen his administration by calling them to his aid. Some of his appointments proved failures, while others were completely successful. Thus Laplace was made Minister of the Interior; but he had no sooner been appointed than it was seen that a mistake had been made. Napoleon afterwards said of him, that "Laplace looked at no question in its true point of view. He was always searching after subtleties; all his ideas were problems, and he carried the spirit of the infinitesimal calculus into the management of business." But Laplace's habits had been formed in the study, and he was too old to adapt them to the purposes of practical life.