A person fully alive to their purpose is a powerful force. As an investor, one of the most important qualities I look for in founders is whether they are clearly mission-driven, fueled by passion, not just ambition, which can fade when the going gets tough. When you care deeply enough about the mission, quitting can actually become harder than pushing through the pain. Life and people will do their best to dull that fire, so protect it. Feed it with the people, habits, and rhythms that constantly remind you why you started.