If a man is endowed with an ethical sense and is convinced of the sanctity of ethical values, he is on the surest road to a conflict of duty. And although this looks desperately like a moral catastrophe, it alone makes possible a higher differentiation of ethics and a broadening of consciousness. A conflict of duty forces us to examine our conscience and thereby to discover the shadow.
Depth Psychology and a New Ethic. (1949). In CW 18. P.17