I should think we all have a measure of both, depending on the domains. Hard to fathom anyone having all of one or the other with exclusivity or even majority.
Certainty is a hell of a drug and we all fall prey to it, particularly if we are accustomed to believing we are more intelligent in some fashion than others.
if you come across it, I’m interested. It could have been someone related to him such as Bohr or Wheeler perhaps? There were a lot of great minds within a very short 15 year span that had a lot of amazing things to say.