The Human or Rational Soul
Most of the principles of this science are connected with Natural Science, and the place for expounding their proof is in (a treatment of) the questions of that science. However, inasmuch as the present science is of commoner profit and more comprehensive advantage than the latter, the total transference of such preliminaries to that science would necessarily place a large number of students at a loss. Accordingly, they will be set down, in narrative style and summary form, this being sufficient to present the general notions69 of these matters. A full exposition and a complete proof will be reserved to their proper place, if God Almighty will.