reading, watching & listening to

As I will use the term, then, a sermon is any message designed to change or reinforce what a group of people value. It might take the form of explicit exhortation, full of shoulds and shouldn'ts , oughts and mustn'ts . Or it may be entirely implicit, like the story of a selfless act that saves the day, huzzah! Commencement speeches, TED talks,... See more

And if you want to predict the future, go to a history lecture or set your WARC case study date filter to twenty years ago.