Kennedy's real point isn't simply that change happens—it's that clinging to what you know *blinds* you to what's coming, which is far more unsettling than mere evolution. The trap he's identifying is that past success and present comfort become intellectual anchors, making us defend yesterday's solutions rather than imagine tomorrow's problems. A surgeon trained exclusively in one technique may miss that a newer approach could save more lives; a newspaper editor confident in print's relevance may not recognize the shift to digital until readers have already left. The sting here is that being thoughtful about the past—learning from it—can paradoxically make you worse at the future if you mistake understanding for prophecy.