1. Knowledge of Nature and Knowledge of the Mind

If we look at the development of science on the one hand and the development of historical views on the other, then it must be said that anyone who, with all seriousness and from the inner experiences of the whole human being, the full human being, experienced the last stage of development of our spiritual life at the end of the 19th century and at the beginning of the twentieth century encountered, as it were, two cornerstones; two cornerstones, one of which once caused a great stir but is now almost forgotten, that is, forgotten from the point of view that it is no longer consciously remembered. But it lives on in the way in which questions of world view are treated today. This cornerstone is the once famous “Ignorabimus” – “We will never know” – of Du Bois-Reymond from the 1870s. Du Bois-Reymond, who was a representative natural scientist of his time, wanted to strictly define the boundaries of scientific thought, and he concluded the debates in which the natural scientist's ignorabimus was contained with the words: Natural science will never be able to fathom the essence of the material itself, that is, the essence of that which underlies the external world, the world that can be observed by our senses and dissected by our minds. In the face of this world, one must utter the ignorabimus — Du Bois-Reymond believed — because anything that would go beyond the indicated limits would lead to supernaturalism. This would lead to a kind of supersensible research — Du Bois-Reymond believes, by presenting the sentence in a monumental way, that where supernaturalism begins, science ends.