Hence, our evidence for serpent-cults everywhere represents varying stages in the historical development of a few related fundamental ideas which are psychologically explicable; and it is impossible to deal with the subject geographically or historically.
Nay, it may be questioned how far it is either psychologically or logically possible to turn general scepticism into a coherent doctrine.
This is the origin of knowledge, psychologically regarded (in the De Anima).
In Germany, since the victory of Kant over Wolff, realism has always been in difficulties, which we can appreciate when we reflect that the Germans by preference apply the term " realism " to the paradoxes of Herbart (1776-1841), who, in order to avoid supposed contradictions, supposed that bodies are not substances, but show (Schein), while " reals" are simple substances, each with a simple quality, and all preserving themselves against disturbance by one another, whether physically or psychologically, but not known to be either material or spiritual because we do not know the simple quality in which the nature of the real consists.
Psychologically, Aristotle applied his dualism of matter and form to explain the antithesis of body and soul, so that the soul is the form, or entelechy, of an organic body, and he applied the same dualism to explain sensation, which he supposed to be reception of the sensible form or essence, without the matter, of a body, e.g.