Kants Begriff moralischer Verpflichtung

According to Kant, to be morally obliged is to be aware of a moral principle, which in turn is 'constituted' by reason. We feel subjectively obliged because we are aware of an objective moral principle by virtue of our sensual-rational dual nature through the feeling of respect. The demand of the moral law is in turn objectively justified by the fact that it is a law of reason.