If you ever have the good fortune to create a great advertising campaign, you will soon see another agency steal it. This is irritating, but don't let it worry you; nobody has ever built a brand by imitating somebody else's advertising.

Can advertising foist an inferior product on the consumer? Bitter experience has taught me that it cannot. On those rare occasions when I have advertised products which consumer tests have found inferior to other products in the same field, the results have been disastrous.

The advertisers who believe in the selling power of jingles have never had to sell anything.

David Ogilvy Quotes