M. Valentine, Theoretical Ethics
“ It is to be particularly observed, further, that the obligation, thus perceived and then felt, is perceived and felt as due by the moral agent with respect to right and wrong. The ethical quality of rightness belongs to the act or principle of action. The motive, the intention, the conduct of men, is in itself morally right or wrong, good or evil. But the obligation appears as what is owed by the moral agent to what is right. The relation between right and obligation corresponds to that between right and duty. Right is in the conduct; duty is for the responsible person. ”
