Bacon, Galileo, Descartes

The transition from the epoch we have been considering to that which follows, has been distinguished by three extraordinary personages, Bacon, Galileo, and Descartes. Bacon has revealed the true method of studying nature, by employing the three instruments with which she has furnished us for the discovery of her secrets, observation, experiment and calculation. He was desirous that the philosopher, placed in the midst of the universe, should, as a first and necessary step in his career, renounce every creed he had received, and even every notion he had formed, in order to create, as it were, for himself, a new understanding, in which no idea should be admitted but what was precise, no opinion but what was just, no truth of which the degree of certainty or probability had not been scrupulously weighed. But Bacon, though possessing in a most eminent degree the genius of philosophy, added not thereto the genius of the sciences; and these methods for the discovery of truth, of which he furnished no example, were admired by the learned, but produced no change in the march of the sciences.

Galileo had enriched them with the most useful and brilliant discoveries; he had taught by his own example the means of arriving at the knowledge of the laws of nature in a way sure and productive, in which men were not obliged to sacrifice the hope of success to the fear of being misled. He founded the first school in which the sciences have been taught without a mixture of superstition, prejudice, or authority; in which every other means than experiment and calculation have been rigorously proscribed; but confining himself exclusively to the mathematical and physical sciences, he was unable to communicate to the general mind that impulsion which it seemed to want.

This honour was reserved for the daring and ingenious Descartes. Endowed with a master genius for the sciences, he joined example to precept, in exhibiting the method of finding and ascertaining truth. This method he applied to the discovery of the laws of dioptrics, of the collision of bodies, and finally of a new branch of mathematical science, calculated to extend and enlarge the bounds of all the other branches.

He wished to extend his method to every object of human intelligence; God, man, the universe, were in turn the subject of his meditations. If, in the physical sciences, his march be less sure than that of Galileo, if his philosophy be less wary than that of Bacon, if he may be accused of not having sufficiently availed himself of the lessons of the one, and the example of the other, to distrust his imagination, to interrogate nature by experiment alone, to have no faith but in calculation, to observe the universe, instead of instructing it, to study man instead of trusting to vague conjectures for a knowledge of his nature; yet the very boldness of his errors was instrumental to the progress of the human species. He gave activity to minds which the circumspection of his rivals could not awake from their lethargy. He called upon men to throw off the yoke of authority, to acknowledge no influence but what reason should avow: and he was obeyed, because he subjected by his daring, and fascinated by his enthusiasm.

Condorcet considers the last the most important of the era.