Sermon (noun)

1. A talk on a religious or moral subject, especially one given during a church service.
2. A discourse delivered by a member of the clergy as part of a religious service.
3. A long, serious speech or lecture, especially one given by a religious leader.

Origin:

Middle english: from old french sermun, from latin sermo "speech, discourse".

Examples:

1. The preacher delivered a powerful sermon on the importance of forgiveness.
2. He listened to the sermon with interest.
3. The sermon was based on a passage from the Bible.
4. The sermon was about the importance of love and compassion.
5. The sermon was well received by the congregation.