A Self-Fulfilling Prophecy

“Some things can become true merely because we believe in them–that pessimism becomes a self-fulfilling prophecy. When modern economists assumed that people are innately selfish, they advocated policies that fostered self-serving behavior. When politicians convinced themselves that politics is a cynical game, that’s exactly what it became.”
― Rutger Bregman

From the book: Humankind A Hopeful History / Utopia for Realists And How We Can Get There