(Annie Olson, in her webpage at LeTourneau University, describes Ethos as being "all about your credibility, reliability, and authority as a speaker or writer. Essentially, ethos is your reputation with your audience and the strategies you use to convince your audience that you should be believed or taken seriously.")
One of the speakers was Steve Forbes. I anticipated that his ethos might be questioned by some who saw him as just the son of a very rich father who left him a thriving financial empire. This concern had not escaped Mr. Forbes. He opened his talk with something like the following:
The best piece of advice I can give you regarding success is this: Choose rich and successful parents!
Forbes practiced wise rhetorics here - by acknowledging the perceived objection, and by dealing with it up front so he could move on with his speech.