– Homer
– Robert Frost
– Henry Seely
– Ernest Hemingway
– Chinese Proverb
– Homer, The Iliad
– Mahabharata
– John Steinbeck, The Pastures of Heaven, p 56
– Mehmet Murat ildan
– Howard Thurman
– Immanuel Kant
– Proverbs 7:17-18
– Jack Handey Deep Thoughts
– Ralph Waldo Emerson
– Dante Alighieri
– Dave Barry
– Martin Luther
– Arabic Proverb
– Lydia Maria Child
– George Bernard Shaw
– Butler
– Robert Frost, The Road Not Taken