In 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.

About Frank Wilczek

Frank Anthony Wilczek ( or ; born May 15, 1951) is an American theoretical physicist. He shared the 2004 Nobel Prize in Physics with David Gross and H. David Politzer "for the discovery of asymptotic freedom in the theory of the strong interaction".