To come to the life of Descartes - he was born in 1596, at La Haye in Touraine, of an ancient and noble race. He received an education of the usual kind in a Jesuit school, and made great progress; his disposition was lively and restless; he extended his insatiable zeal in all directions, pursued his researches into all systems and forms; his studies, in addition to ancient literature, embraced such subjects as philosophy, mathematics, chemistry, physics, and astronomy. But the studies of his youth in the Jesuit school, and those studies which he afterwards prosecuted with the same diligence and strenuous zeal, resulted in giving him a strong disinclination for learning derived from books; he quitted the school where he had been educated, and yet his eagerness for learning was only made the keener through this perplexity and unsatisfied yearning. He went as a young man of eighteen to Paris, and there lived in the great world. But as he here found no satisfaction, he soon left society and returned to his studies. He retired to a suburb of Paris and there occupied himself principally with mathematics, remaining quite concealed from all his former friends. At last, after the lapse of two years, he was discovered by them, drawn forth from his retirement, and again introduced to the great world. He now once more renounced the study of books and threw himself into the affairs of actual life. Thereafter he went to Holland and entered the military service, soon afterwards, in 1619 and in the first year of the Thirty Years’ War, he went as a volunteer with the Bavarian troops, and took part in several campaigns under Tilly. Many have found learning unsatisfying; Descartes became a solider - not because he found in the sciences too little, but because they were too much, too high for him. Here in his winter quarters he studied diligently, and in Ulm, for instance, he made acquaintance with a citizen who was deeply versed in mathematics. He was able to carry out his studies even better in winter quarters at Neuberg on the Danube, where once more, and now most profoundly, the desire awoke in him to strike out a new departure in Philosophy and entirely reconstruct it; he solemnly promised the Mother of God to make a pilgrimage to Loretto if she would prosper him in this design, and if he should now at last come to himself and attain to peace. He was also in the battle at Prague in which Frederick the Elector-Palatine lost the Bohemian crown. Yet since the sight of these wild scenes could not satisfy him, he gave up military service in 1621. He made several other journeys through the rest of Germany, and then proceeded to Poland, Prussia, Switzerland, Italy and France. On account of its greater freedom he withdrew to Holland, in order there to pursue his projects; here he lived in peace from 1629 to 1644 - a period in which he composed and issued most of his works, and also defended them against the manifold attacks from which they suffered, and which more especially proceeded from the clergy. Queen Christina of Sweden finally called him to her court at Stockholm, which was the rendezvous for all the most celebrated men of learning of the time, and there he died in 1650. (1)As regards his philosophic works, those which contain his first principles have in particular something very popular about their method of presentation, which makes them highly to be recommended to those commencing the study of philosophy. Descartes sets to work in a quite simple and childlike manner, with a narration of his reflections as they came to him. Professor Cousin of Paris has brought out a new edition of Descartes in eleven octavo volumes; the greater part consists of letters on natural phenomena. Descartes gave a new impetus to mathematics as well as to philosophy. Several important methods were discovered by him, upon which the most brilliant results in higher mathematics were afterwards built. His method is even now an essential in mathematics, for Descartes is the inventor of analytic geometry, and consequently the first to point out the way in this field of science to modern mathematics. He likewise cultivated physics, optics, and astronomy, and made the most important discoveries in these; we have not, however, to deal with such matters. The application of metaphysics to ecclesiastical affairs, investigations, etc., has likewise no special interest for us.
1. In Philosophy Descartes struck out quite original lines; with him the new epoch in Philosophy begins, whereby it was permitted to culture to grasp in the form of universality the principle of its higher spirit in thought, just as Boehme grasped it in sensuous perceptions and forms. Descartes started by saying that thought must necessarily commence from itself; all the philosophy which came before this, and specially what proceeded from the authority of the Church, was for ever after set aside. But since here thought has properly speaking grasped itself as abstract understanding only, in relation to which the more concrete content still stands over on the other side, the determinate conceptions were not yet deduced from the understanding, but taken up only empirically. In Descartes’ philosophy we have thus to distinguish what has, and what has not universal interest for us: the former is the process of his thoughts themselves, and the latter the mode in which these thoughts are presented and deduced. Yet we must not consider the process as a method of consistent proof; it is indeed a deep and inward progress, but it comes to us in an ingenuous and naive form. In order to do justice to Descartes’ thoughts it is necessary for us to be assured of the necessity for his appearance; the spirit of his philosophy is simply knowledge as the unity of Thought and Being. And yet on the whole there is little to say about his philosophy.
