It is pretty obvious that the debasement of the human mind caused bya constant flow of fraudulent advertising isno trivial thing.There ismorethan one way to conquer a country.

-Chandler, Raymond
  Letter to Carl Barndt,15 Nov.

Advertising may be described as the science of arresting human intelligence long enough to get money from it.

-Leacock, Stephen Butler
  The Garden of Folly,'The Perfect Salesman'.

It is the professional duty of the advertising agent to conceal his artifice.When Aeschines spoke, they said, 'How well he speaks', but when Demosthenes spoke, they said 'Let us march against Philip.'

-Ogilvy, David
  Confessions of an  Advertising Man, ch.5.

Every occupation, unless it employs the whole mind and satisfies the human creative instinct, is to some extent absurd; and abouttheadvertising business what I chiefly disliked was not so much the work I did as its general atmosphere of unreality.We dealt in fairy-goldöin fugitive dreams and illusions.

-Quennell, Sir Peter Courtney
  The Marble Foot: an Autobiography,1905^1938, p.227.

The moral of all this†is that we have the kind of advertising we deserve.

-Sayers, Dorothy L(eigh)
  'The Psychology of Advertising', in The Spectator,19 Nov.

  What is the difference between unethical and ethical advertising? Unethical advertising uses falsehoods to deceive the public; ethical advertising uses truth to deceive the public.

-Stefansson,Vilhjalmur
Discovery (published1964).

Manya small thing has beenmade large by theright kind of advertising.

-Twain, Mark pseudonym of  Samuel Langhorne Clemens
  A ConnecticutYankee in King Arthur's Court, ch.22.