“Given the fluid, ever-changing nature of thought and therefore of meaning, the best approach is to believe whatever you believe but hold it lightly. We need a certain structure of belief to function and orient in the world. But we don't need a final belief or formula for how something works or what something means. You can play with beliefs and meanings and see what effect they have. If a belief is working—great. And if a belief isn't working—great, because then you can change it.”