
“That is simple, my friend. It is because Politics is more difficult than physics.”
Einstein when asked "Dr. Einstein, why is it that when the mind of man has stretched so far as to discover the structure of the atom we have been unable to devise the political means to keep the atom from destroying us?” a conferee at a meeting at Princeton, N.J. (Jan 1946), as recalled by Greenville Clark in "Letters to the Times" in New York Times (22 Apr 1955), 24
1940s
Variant: That is simple, my friend. It is because Politics is more difficult than physics.