The story is often told that when Einstein was asked how it felt to be the smartest man on Earth, Einstein replied, “I wouldn't know. Ask Nikola Tesla”.
I have seen the quote often, and have searched for its origin, and have yet to find it.
https://www.quora.com/Did-Einstein-really-say-I-dont-know-you-will-have-to-ask-Nikola-Tesla
https://www.quora.com/Do-Nikola-Tesla-and-Einstein-work-alone-and-not-in-teams
Nikola Tesla/Later years https://en.wikibooks.org/wiki/Nikola_Tesla/Later_years