15. Spiritual Science, Natural Science and Technology

But it is easier to express speculative results and all kinds of philosophies about what the spirit is, it is easier to be a pantheist or the like out of speculation than to follow the example of strict natural science, only with the experiential method, as I have described it, to continue the scientific research and then to come to it, [to find the spiritual in the material] - just as one brings warmth to light, even if it does not express itself, by showing under which circumstances that which is latent reveals itself. If we apply this method, which is usually applied externally, and continue it internally, but especially to the whole human being, then we will understand the spiritual in the material from the inside out. And above all, that which has actually been resonating to us from ancient times and yet, for human beings, is a profound necessity, that which still resonates from the Apollonian temple at Delphi to the ears of the spirit: 'Man, know thyself!' And just as philosophers and theologians have spoken of this “know thyself”, so too has the naturalist Ernst Haeckel, who was more or less inclined towards materialism. This “know thyself” is deeply rooted in human nature, and the modern age has now reached a point where this “know thyself” must be approached in a concrete way.