I know of a brewer who sells more of his beer to the people who never see his advertising than to the people who see it every week. Bad advertising can unsell a product.
David OgilvyGreat hospitals do two things. They look after patients, and they teach young doctors. We look after clients, and we teach young advertising people.
David OgilvyDo not address your readers as though they were gathered together in a stadium. When people read your copy, they are alone. Pretend you are writing to each of them a letter on behalf of your client.
David Ogilvy