“But how do you know you’re right?” he insisted. “How do you know Earthseed is true. Who says it’s true?” “You do, Dan.” I let him chew on that for a while, then went on. “You learn, you think, you question. You question us and you question yourself. Then, if you find Earthseed to be true, you join us. You help us teach others. You help others the way we’ve helped you and your sisters.”