Homiletic is an adjective that means related to preaching or writing a sermon. 

The Greek word homilia (ho MEAL ee uh) means ‘to converse with.’ In time, this word gave birth to the English word homily which referred to a sermon or a story with a religious meaning. Homiletic has been with us since the mid 17th century. Example:

I enjoyed the story my dad told me about his days as a young hunter. But it seemed to be the stories had no moral. They may have had a greater impact had they had more of a homiletic purpose.