The only lessons that re meaningful are those we learn by example. Talk is cheap. "Do as I say not as I do" doesn't sell. Duz it?

Having a doctor who weighs 300 lbs tell you to lose weight is a JOKE!
Or someone who smokes telling you smoking is bad for you and you should quit. Bullsh**!
Or someone preaching religion to you whilst simultaneously doing the Devil's work in plain sight.

Of course the gullibles will buy whatever anyone has to sell no matter what. If they adore support admire respect the seller. Gullibles are the best group to pitch.