Murray Gell-Mann’s (quarks, Nobel prize winner, peer to Feynman at Caltech) TEDtalk from 2007 on the relationship between beauty (simplicity) and truth in science and mathematics:
What is especially striking is that in fundamental physics a beautiful or elegant theory is more likely to be right than a theory that is inelegant.
He goes on to give a bunch of anecdotes that show this playing out over and over during the development of particle physics.