I. Guiding Thoughts on the Method of Presentation

With the close of this third period the character of philosophical endeavor changes. The self-consciousness of the soul has been strengthened through century-long work performed in the examination of the reality of thought life. One has learned to feel the life of thought as something that is deeply related to the soul's own nature and to experience in this union an inner security of existence. As a mark of this stage of development, there shines like a brilliant star in the firmament of the spirit, the words, “I think, therefore I am,” which were spoken by Descartes (1596–1650). One feels the soul flowing in thought life, and in the awareness of this stream one believes one experiences the true nature of the soul itself. The representative of that time feels himself so secure within this existence recognized in thought life that he arrives at the conviction that true knowledge could only be a knowledge that is experienced in the same way as the soul experiences thought life resting on its own foundation. This becomes the viewpoint of Spinoza (1632–1677).