The spirit of the times is what lives and transforms in our history. It is the powerful ruler of each individual, for it is from him that everyone is nourished and raised. It depends solely on him whether small strength can achieve the greatest or whether the greatest remains unnoticed and suppressed. Yet it is again in the struggle with him that one must measure who wants to work for the formation of the spirit. This especially applies to the self-activity of reason in philosophy. I saw the main task as the anthropological justification of all philosophical fundamental truths. Now, Kant referred to the justification of the use of categories as deduction. I have retained this term because my justification had the same purpose and, with a proper understanding of the transcendental proofs, also employed similar means. However, in the execution, it becomes from my De.