As we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns – the ones we don't know we don't know.

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Guy de Maupassant • Anna Eleanor Roosevelt • Confucius • Henry David Thoreau • Voltaire • Mike Monteiro • Friedrich Nietzsche • Zig Ziglar • Elwyn Brooks "E. B." White • Steven Wright • Albert Einstein • anonymous • Martin Luther King Jr. • Marshall McLuhan • Miguel de Cervantes Saavedra • Kurt D. Cobain • Rabindranath Tagore • Theodor Seuss Geisel • John Maeda • Pablo Picasso • Oscar Wilde • Winston Churchill • Mahatma Gandhi • Kahlil Gibran

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