I have learned that it is far easier to write a speech about good advertising than it is to write a good ad.
Leo BurnettGood advertising should give the reader essential facts about the product or company advertised and should do so engagingly without trickery or hogwash.
Leo BurnettThe greatest thing to be achieved in advertising, in my opinion, is believability, and nothing is more believable than the product itself.
Leo Burnett