I have heard a proof that hearing is nothing in compared to seeing, and the proof is from Yitro: that even though he had heard about all the great miracles that had occurred to the Jews and their encounters with the Egyptians and Pharaoh, it was only after coming to the desert to meet his son-in-law Moshe (Exodus 18:5) that he said (Exodus 18:11):
עַתָּ֣ה יָדַ֔עְתִּי כִּֽי־גָד֥וֹל יְהוָ֖ה מִכָּל־הָאֱלֹהִ֑ים כִּ֣י בַדָּבָ֔ר אֲשֶׁ֥ר זָד֖וּ עֲלֵיהֶֽם
I'm looking for the source for this idea. Have you seen this anywhere?