"Journalist: Does he share the opinion of Sciascia [...] that "for others science was a matter of will, for him a matter of nature"? To write Il était sept fois la révolution, I studied a lot the works of the founding fathers of quantum physics: Einstein, Pauli, Dirac, Schrödinger, Heisenberg... In all of them one can feel moments of discouragement, doubt, fatigue, alternating with moments of enthusiasm of intellectual joys. In Majorana, on the contrary, things have the air of advancing continuously, without obstacles, without the onset of any Eureka! Physics seems to flow through him with nothing to hold it back, without barriers."
January 1, 1970
https://en.wikiquote.org/wiki/%C3%89tienne_Klein