Why might edwards oratory have been less effective if he had not had a reputation as a brilliant spiritual leader?

It might be said that the speaker´s credibility is important to make the speech or sermon persuasive. he had helped to bring religious revival known as the Great Awakening. his sermons accused members of the church by name of being sinners. he was known for his extremism as a pastor.

The best bet is to google

There is lots of evidence