Hahaha, do you want to hear something funny? A Jew from Poland by the name of David Grün and then became David Ben-Gurion was giving testimony at the United Nations and then he interrupted his testimony to remind the people that even though he was speaking in English that he was actually thinking in Hebrew. That is so hilarious! How can anybody prove in what language he is thinking? There is no way to prove that. He was trying to make sure that nobody doubted that he was a pure Hebrew! Hilarious! Imagine a German who speaks fluent English saying that even though he was speaking in English but he was actually thinking in German! He would never say that because it would be obvious to everyone that German is his primary language.