A little cooling down of animal excitability and instinct, a little loss of animal toughness, a little irritable weakness and descent of the pain-threshold, will bring the worm at the core of all our usual springs of delight into full view, and turn us into melancholy metaphysicians.
Metaphysics means nothing but an unusually obstinate effort to think clearly.
The unrest which keeps the never stopping clock of metaphysics going is the thought that the nonexistence of this world is just as possible as its existence.
The states of consciousness are all that psychology needs to do her work with. Metaphysics or theology may prove the Soul to exist; but for psychology the hypothesis of such a substantial principle of unity is superfluous.
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