A sermon, instructive discourse.

Preaching; the delivery of a sermon or exhortation. Now usually depreciative: obtrusive or tiresome preaching; sermonizing.

An act of preaching; a sermon, a lecture; a solemn discourse or admonition.

transferred and figurative. A discourse (spoken or written) on a serious subject, containing instruction or exhortation. Also contemptuously, a…

A book, writing, or speech intended to exhort or instruct; an exhortation, an instruction.