A boring-like speech given for an extended period of time by a so-called expert in his field for the sole purpose of teaching the audience a subject or valuable lesson.
Sermons are often delivered to the audience by total hypocrites, so please tread with caution.
1. Church sermons by a priest/pastor/preacher
2. Commencement addresses at graduation ceremonies
3. Parents to their children whenever they do something the parents used to do that they now feel is wrong