One of my favorite references to him is a recommendation[1] written by Oppenheimer about Feynman. The line was: "He's a second Dirac, only this time human."

Edit: to be fair Oppenheimer was quoting Wigner... Dirac went on to marry Wigner's sister.

[1] http://www.lettersofnote.com/2009/12/he-is-second-dirac-only...