If you can’t find opposing voices, manufacture them. Build a mental model of your favorite adversary, and have imaginary conversations with them. This is what Marc Andreessen does. “I have a little mental model of Peter Thiel,” explains Andreessen, referring to fellow venture capitalist and PayPal cofounder, “a simulation that lives on my shoulder, and I argue with him all day long.”59 He added, “People might look at you funny while it’s happening,” but it’s well worth the ridicule.
