It takes a big idea to attract the attention of consumers and get them to buy your product. Unless your advertising contains a big idea, it will pass like a ship in the night. I doubt if more than one campaign in a hundred contains a big idea.
David Ogilvy

It is beyond a doubt that all our knowledge that begins with experience.
Immanuel Kant

A conservative is someone who makes no changes and consults his grandmother when in doubt.
Woodrow Wilson

The major parties could conduct live human sacrifices on their podiums during prime time, and I doubt that anybody would notice.
Dave Barry

Defined in psychological terms, a fanatic is a man who consciously over-compensates a secret doubt.
Aldous Huxley

A fanatic is a man who consciously over compensates a secret doubt.
Aldous Huxley

There is no doubt that life is given us, not to be enjoyed, but to be overcome; to be got over.
Arthur Schopenhauer

Without a doubt, the best way to get to know me is through my music.
Shania Twain

All, all is theft, all is unceasing and rigorous competition in nature; the desire to make off with the substance of others is the foremost - the most legitimate - passion nature has bred into us and, without doubt, the most agreeable one.
Marquis de Sade

Buddhism is not a creed, it is a doubt.
Gilbert K. Chesterton

If I had not actually got into this work and been called of God, I would back out. But I cannot back out: I have no doubt of the truth.
Joseph Smith, Jr.

In your hands or that of any other person, so much power would, no doubt, be dangerous. I am the only man in the world whom it would be safe to trust with it. Remember, I am a prophet!
Joseph Smith, Jr.

They who have conquered doubt and fear have conquered failure.
James Allen

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
Rene Descartes

The first precept was never to accept a thing as true until I knew it as such without a single doubt.
Rene Descartes

Who never doubted, never half believed. Where doubt is, there truth is - it is her shadow.
Ambrose Bierce

Doubt, indulged and cherished, is in danger of becoming denial; but if honest, and bent on thorough investigation, it may soon lead to full establishment of the truth.
Ambrose Bierce

Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt.
Ambrose Bierce

Doubt is the father of invention.
Ambrose Bierce

Doubt begins only at the last frontiers of what is possible.
Ambrose Bierce