, the human soul, that its will is free and yet that it is simultaneously subject to natural necessity,.e., that it is not free, without falling into an obvious contradiction; because in both propositions I would have taken the soul in just the same meaning, namely as a thing in general (as a thing in itself), and without prior critique, I To cognize an object, it is required that I be able to prove its possibility (whether by the testimony of experience from its actuality or a priori through reason).