Morality fulfills the essential inner-outer linkage we experience in being in the world. A basis, in fact, for the subject-object distinction of knowing. Morality is thus natural, not contrived, flowing from the Dao rather than man-made. Although it can be imbalanced, put out of kilt by man. Not to the self, but to finding the proper balance between self and no-self.
Moral conduct is aided by the three guiding principles.
Philosophy and science, psychology, spirituality.