Nay, it may be questioned how far it is either psychologically or logically possible to turn general scepticism into a coherent doctrine.
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.
As a branch of mathematics, arithmetic may be treated logically, psychologically, or historically.
What Cousin finds psychologically in the individual consciousness, he finds also spontaneously expressed in the common sense or universal experience of humanity.
By Kant, however, these forms are generally treated psychologically as the action of the several faculties of a mind.