Columbia subject headings:
Casuistry.
Defoe, Daniel, 1661?-1731--Religion.
Harvard subject headings:
Casuistry.
Defoe, Daniel, 1661?-1731--Religion and ethics.
Princeton subject headings:
Casuistry.
Defoe, Daniel, 1661?-1731--Ethics.
Didactic fiction, English--History and criticism.
Ethics in literature.