"I am rather inclined to think that, though the subject is beyond our comprehension at present, that man does not consist of two principles, so essentially different from one another as matter and spirit, which are always described as having not one common property, by means of which they can affect or act upon each other; the one occupying space, and the other not only not occupying the least imaginable portion of space, but incapable of bearing relation to it; insomuch that, properly speaking, my mind is no more in my body, than it is in the moon."
— Priestley, Joseph (1733-1804)
See Hartley’s Theory of the Human Mind, on the Principle of the Association of Ideas; With Essays Relating to the Subject of It. By Joseph Priestley, LL. D. F. R. S. (London: Printed for J. Johnson, No. 72, St. Paul’s Church-Yard, 1775). <Link to ESTC>