cannot be established as regards its objective reality in any experience possible for us and thus adequately for the theoretical use of Reason; but its use is commanded by practical pure Reason [in reference to the best possible working out of that purpose], and it consequently must be assumed possible. This commanded effect, together with the only conditions of its possibility thinkable by us, viz. the Being of God and the immortality of the soul, are things of faith (res fidei), and of all objects are the only ones which can be so called. For though what we learn by testimony from the experience of others must be believed by us, yet it is not therefore a thing of faith; for it was the proper experience of some one witness and so a thing of fact, or is presupposed as such.

Again it must be possible by