Advertising is prima facie evidence that the man who pays believes that advertising is good. It has brought great results to others, it must be good for him. So he takes it like some secret tonic which others have endorsed. If the business thrives, the tonic gets the credit. Otherwise, the failure is due to fate.
My Life in Advertising and Scientific Advertising (ed. McGraw Hill Professional, 1986) - ISBN: 9780844231013