Kant, Immanuel - Dreams of a Spirit Seer - 04 Chapter One
Type of Spiritual Experience
A description of the experience
Chapter One continued
From these considerations no valid reason can be brought forward, why my soul should not be one of the substances of which matter consists, nor why its peculiar manifestations should not originate in the place which it occupies in such an ingenious machine as the human body, where the combination of nerves favours the inner faculty of thinking and of will-power.
In that case, however, there would remain no peculiar characteristic of the soul by which it could be surely recognized and distinguished from crude elementary matter, and the jocose suggestion of Leibnitz would not be laughable any more, that in our coffee we swallow, perhaps, atoms which are to become human souls. .....................