In physics, you don't have to go around making trouble for yourself - nature does it for you.
Frank WilczekThe brain rewards us for interacting with beautiful things. In this way, evolution wants to encourage us to do what is good for us.
Frank WilczekIn physics, your solution should convince a reasonable person. In math, you have to convince a person who's trying to make trouble. Ultimately, in physics, you're hoping to convince Nature. And I've found Nature to be pretty reasonable.
Frank Wilczek