In "The 48 Laws of Power," Law 21 states "Play a Sucker to Catch a Sucker - Seem Dumber Than Your Mark," essentially advising that to gain power over someone, strategically appear less intelligent than them, making them feel superior and less likely to suspect your true intentions; it's about letting others feel smarter than you are to manipulate them. 

Key points about Law 21:Appear less intelligent:Don't showcase your full intellect, instead, let others feel like they are the smarter ones in the conversation.Gain trust and complacency:By seemingly playing dumb, you can lower people's guard and make them more trusting.Gather information:While appearing less informed, you can listen actively and gather valuable insights from others who feel comfortable explaining things to you.Use it strategically:This tactic should be used carefully and not as a way to genuinely diminish your abilities, but as a tool to achieve your goals.