“All men are enemies. All animals are comrades”

I Think I'll Sit This One Out (1939)
Context: It is a sensible military tactic to recognize the enemy before you shoot. The common enemy is the animality in man, and not the men here and there who are behaving like animals at the moment. Neither science nor prayer nor force will save us. What will save us is the reason that enables men, in ancient Israel and modern America, to choose between guns and butter, and to choose well. When we have produced men of reason, we shall have a world of reason, and the Hitlers will disappear. As long as we produce men of force we shall have a world of force, and the Hitlers, whoever wins the wars, will carry the day.
Society may make many demands on me, as long as it keeps me out of the cave. It may take my property. It may take my life. But when it puts me back into the cave I must say, politely but firmly, to hell with society. My ancestors were cannibals without benefit of parliaments.

Source: Animal Farm

Source: Reminiscences of a Stock Operator (1923), Chapter XXIII, p. 278

Source: You Get So Alone at Times That it Just Makes Sense

Source: Memories of My Life (1908), Chapter V Cambridge

Writing and Being (1991)

1964, p. 141; Chapter 1; Chapter 1: The Origin of Speech
Speech, 1930

Quoted in Some Glimpses of Occultism: Ancient and Modern https://books.google.it/books?id=WufWAAAAMAAJ by C. W. Leadbeater, Rajput Press, 1909, p. 265.