1 John Adams

1 Samuel Adams

4 Hannah Arendt

3 Aristotle

3 Marcus Aurelius

1 Claude Bernard

1 Norman Bethune

1 Ambrose Bierce

1 William Blake

3 Napoleon Bonaparte

1 Charlotte Bront

1 Elizabeth Barrett Browning

1 William Cullen Bryant

4 Edmund Burke

1 George Carlin

1 Thomas Carlyle

1 Coco Chanel

1 Anton Chekhov

11 Cicero

1 Arthur C. Clarke

2 Carl von Clausewitz

1 Samuel Taylor Coleridge

1 Confucious

1 Jacques-Yves Cousteau

1 Salvador Dali

1 Clarence Darrow

1 Charles Darwin

1 René Descartes

2 John Dewey

1 Marlene Dietrich

1 Fyodor Dostoyevsky

3 Arthur Conan Doyle

4 Albert Einstein

1 Dwight D. Eisenhower

4 Ralph Waldo Emerson

2 Epictetus

2 Epicurus

1 Euripides

1  Viktor E. Frankl

1 Benjamin Franklin

1 Khalil Gibran

17 Johann Wolfgang von Goethe

1 Frederick the Great

1 Stephen Hawking

6 Friedrich A. Hayek

2 Friedrich August von Hayek

2 Henry Hazlitt

1 Georg Wilhelm Friedrich Hegel

2 Hegel

1 Katharine Hepburn

1 Hesiod

1 Hippocrates

2 Oliver Wendell Holmes

1 Homer

1 Elbert Hubbart

1 Victor Hugo

1 Aldous Huxley

1 Robert G. Ingersoll

1 Henry James

2 William James

5 Thomas Jefferson

1 Samuel Johnson

4 Juvenal

2 Immanuel Kant

5 John F. Kennedy

7 John Maynard Keynes

1 Soren Kierkegaard

1 Søren Kierkegaard

1 Henry Kissinger

1 Jack Layton

1 Bruce Lee

1 Vladimir Lenin

8 Abraham Lincoln

5 John Locke

1 Moses Maimonides

1 Groucho Marx

1 Marshall McLuhan

1 Golda Meir

1 H. L. Mencken

2 H.L. Mencken

1 John Stuart Mill

4 Ludwig von Mises

1 Michel de Montaigne

7 Montesquieu

1 Edward R. Murrow

7 Friedrich Nietzsche

3 Kilroy J. Oldster

1 George Orwell

3 Thomas Paine

1 Blaise Pascal

2 George S. Patton

1 Frederick S. Perls

1 John Pilger

4 Plato

6 Bias of Priene

1 Ayn Rand

1 Ronald Reagan

1 Ronald Reagan

1 François de La Rochefoucauld

1 Eleanor Roosevelt

1 Jean-Jacques Rousseau

1 Bertrand Russell

1 Carl Sagan

1 George Santayana

3 Jean-Paul Sartre

18 Arthur Schopenhauer

2 Arthur Schopenhauer

1 Seneca

10 Seneca

3 William Shakespeare

1 George Bernard Shaw

2 Fulton J. Sheen

10 Adam Smith

1 Betty Smith

5 Socrates

1 Susan Sontag

5 Sophocles

1 Stephen Spielberg

2 Baruch Spinoza

2 John Steinbeck

2 Tacitus

1 Alfred Lord Tennyson

1 Alvin Toffler

3 Leo Tolstoy

6 Mark Twain

3 Lao Tzu

1 Sun Tzu

4 Virgil

3 Voltaire

3 Kurt Vonnegut

1 George Washington

1 William Westmoreland

2 Oscar Wilde

1 W.B. Yeats

1 William Pitt the Younger
George Bernard Shaw
Those who cannot change their minds cannot change anything.
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