All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us.

Transcendental Doctrine of Elements (Transscendentale Elementarlehre)(A 19, B 33) | First Part. Transcendental Aesthetic (Transscendentale Ästhetik)(A 22, B 37) | Second Part. Transcendental Logic (Transscendentale Logik)(A 50, B 74) | Introduction (Einleitung. Idee einer transscendentalen Logik)(A 50, B 74)