Thus it appears obvious that a necessary universal reduction has in advance the significance of a resolve henceforth to reduce all of men's ways of behaving, one by one, so as to describe scientifically, perhaps with the help of experimentation, the psychic as it already finds its expression in common language,.e., human activity and suffering or, to put it crudely, the psychic sphere of acts according to its empirical types and these always involve, in their meaning, psychophysical causality.