"All synthetical principles a priori are nothing more than principles of possible experience, and can never be referred to things in themselves, but to appearances as objects of experience.
"Apriorizko printzipio guztiak ez dira ezer esperientzia posiblearen printzipio besterik eta ezin dira inoiz ere aplikatu berbaitango gauzetara, fenomeno soiletara baizik, esperientziaren objektu bezala.