“I doubt if more than one campaign in a hundred contains a big idea. I am supposed to be one of the more fertile inventors of big ideas, but in my long career as a copywriter I have not had more than 20, if that. Big ideas come from the unconscious. This is true in art, in science and in advertising. But your unconscious has to be well informed, or your idea will be irrelevant. Stuff your conscious mind with information, then unhook your rational thought process. You can help this process by going for a long walk, or taking a hot bath, or drinking half a pint of claret. Suddenly, if the telephone line from your unconscious is open, a big idea wells up within you.”
— David Ogilvy