The most incomprehensible thing in the universe is that this universe is understandable.

The most incomprehensible thing about this world is that it is actually understandable.

Original text: The most incomprehensible thing about the world is that it is at all comprehensible.

If my theory of relativity is proven correct, the Germans will say that I am German , the French would say I am a citizen of the world. If my theory of relativity is denied, the French will call me a German devil, and the Germans will classify me as a Jew.

Original text: If my theory of relativity is proven correct, Germany will claim me as a German and France will say I am a man of the world. If it's proven wrong, France will say I am a German and Germany will say I am a Jew.