If everyone is thinking alike then somebody isn’t thinking
Page 31. If everyone is thinking alike then somebody isn’t thinking. General George S Patton.
— from The Mind in the Cockpit · Investing with Keynes by Justyn Walsh
In the book
Run a thinking checklist, and keep good company. Borrow Kipling's six honest servants — what, why, when, how, where, and who — and let them interrogate any hard problem. Seek out the people who challenge your thinking, because you learn far more from them than from the ones who only agree with you; remember Patton's line that if everyone is thinking alike, then somebody isn't thinking. And get comfortable being unsure, holding the question open rather than grabbing the first answer. — The Mind in the Cockpit