Hakaras Hatov

What did the sea see that made it split? The Midrash in Yalkut Tehillim says it saw the coffin of Yosef, and compares the sea to Yosef running away. But why would Hashem need such an open miracle at all, when Bnei Yisrael could have fought Mitzrayim? The Ksav Sofer's answer touches how we treat people who did us both good and harm. A short scene from Rav Steinman and a doctor closes it, with a few words that stay with you.