But this expedient of adducing empirical proofs, instead of a deduction from a priori sources of knowledge, is denied us here in respect to the pure practical faculty of reason. For whatever requires to draw the proof of its reality from experience must depend for the grounds of its possibility on principles of experience; and pure, yet practical, reason by its very notion cannot be regarded as such.
Ordezko hori, hots, apriorizko ezagutza-iturrietatik abiatuz dedukzio bat eratu beharrean froga enpirikoak aurkeztea, hemen kendu egin zaigu arrazoimen praktiko hutsari dagokionez.