An unshakeable optimist, Simon Sinek understands that, at our core, humans are social creatures. We need each other if we ever hope to build a better future. The visionary thinker and author of the new book Together is Better says we all need a reminder that our journeys are connected, and that's how it should be. The best teams, he notes, are ones that aren't merely like a family, but rather are a family. In this interview, SUCCESS Editor-in-Chief Josh Ellis asks Sinek about the true joy of leadership, where courage stems from, and the power of vulnerability when surrounded by people you trust.