299. At the same time, however, there is the fact that we are living in the midst of all these energies; they are actually present in great numbers within our organism, in our thinking and mentality, just as we are unable to utter even the smallest sigh without the help of energies outside our bodies. Therefore, why not begin as soon as possible to study the reaction of substances – and not only those which can be handled and seen with physical eyes or are described as "physical chemistry", but on the contrary, why not study to the highest degree those substances present in equally great numbers in the life of our consciousness and mental processes as invisible, fate-forming factors in the creation of character and talents, indeed, of the whole establishment of our basic happiness and enjoyment of life?
      Of what use is it that one learns to be very careful or scrupulous in combining substances for food and nourishment when at the same time one acts quite blindly and ignorantly with regard to the substances used as material for creating one's mentality and conscious behaviour?