I suspect Smullyan was one of those people who achieved enlightenment by pure reason.
Consider "Planet Without Laughter" (note this from the site of Knuth-- that Knuth --and presumably he hosts it there for a reason, so pay attention kids!)
Both Smullyan and Feynmann were born in the immigrant Jewish community of Far Rockaway, NY, almost exactly one year apart. Smullyan was one year younger than Feynmann, but lived 30 years longer.
Yes it did make me smile. My response was only half serious.
The moral I extracted was that free will is fake and humor is all that matters. If that's the case I'd have hoped he'd have thrown a few more jokes in ;)
Consider "Planet Without Laughter" (note this from the site of Knuth-- that Knuth --and presumably he hosts it there for a reason, so pay attention kids!)
https://www-cs-faculty.stanford.edu/~knuth/smullyan.html
Also he looks like Gandalf! :)