sermonise (verb)

1. In the comic book series, the superhero sermonises to the citizens about the importance of truth and justice.

2. The haunted character sermonises to the group about the consequences of meddling with dark forces.

3. The fashion influencer sermonises about the significance of sustainable and ethical clothing choices in her latest video.

4. The renowned architect sermonises during his lecture on the principles of minimalistic design and functionality in residential spaces.