I. Guiding Thoughts on the Method of Presentation

It can be shown that in the evolutionary course of the philosophical struggle of mankind, periods are distinguishable, each of which lasts between seven and eight centuries. In each of these epochs there is a distinctly different impulse at work, as if it were under the surface of external history, sending its rays into the human personalities and thus causing the evolution of man's mode of philosophizing while taking its own definite course of development.