Other forms: sermons
A sermon is a speech, usually religious in nature, given by a priest, preacher, rabbi, or other religious leader as part of a service.
Although most sermons focus on Bible passages, you can use the word sermon more generally to refer to any speech that contains a moral lesson. Sports coaches are known to deliver moving sermons, as are teachers and camp counselors. But if you come in late, after missing your curfew, the last thing you want to hear is a sermon by your mom on the importance of keeping your word.