– Aristotle
– Dejan Stojanovic
– Alvin Toffler
– Bryant McGill
– Emily Dickinson
– Gamal Abdel Nasser
– Don Fraser
– Theodore Roosevelt
– Manfred Eigen
– Newell Dwight Hillis
– Samuel Smiles
– Frederick Buechner, Wishful Thinking, 1973
– Mehmet Murat ildan
– Salvador Dali
– John Updike
– Louise Suggs
– Thomas Huxley
– Dean Koontz, Fear Nothing, Page 4 , final paragraph
– Emily Elizabeth Dickinson
– Monica Baldwin
– Søren Kierkegaard
– Sren Aaby Kierkegaard
– Douglas Noel Adams
– Stephen Jay Gould
– Sun-tzu