In his third lecture on R. Meir Simcha of Dvinsk for Torah in Motion, historian Marc B. Shapiro says: The best proof for me of the truth of Torah it is not at all intellectual. It’s the feeling of a good Shabbos or a good holiday. For Rav Soloveitchick, it was listening to a good shiur.
I have an essay where I wrote that Jewish history is the greatest proof for God’s existence. That the Jewish people survived. The state of Israel.