But if every day is sunny and it doesn’t rain, things don’t grow. And if it’s sunny all the time—if, in fact, we don’t ever even have night—all kinds of things don’t happen and the planet dries up. The key is to view conflict as essential, because that’s how we know the best ideas will be tested and survive. You know, it can’t only be sunlight.
Link · Chapter 7: The Hungry Beast and the Ugly Baby