The physiological study of mental conditions is thus the most powerful ally of hortatory ethics.

因此，精神状况的研究是劝诫伦最有力的友。

Some of these books were, on the face of it, frivolous and facetious;but many, on the other hand, were serious and prophetic, moral and hortatory.

从表面上，一些书是轻浮和滑稽的；但另一方面，许多书是严肃的、预言性的、道德的和规劝性的。