Mitzvah Mission

R’ Pinchas ben Yair was on his way to fulfill the mitzvah of pidyon shevuyim; he came to the Gina’i River and asked it to split for him so that he could continue traveling. The river refused to split for him, arguing, “You are on your way to fulfill the will of your Creator, and I am on my way to fulfill the will of my Creator. For you, it is a doubt whether you will fulfill His will or not. For me, I certainly will fulfill His will.”
R’ Pinchas ben Yair said, “If you do not split, then I will decree upon you that no more water will ever flow through you!” Whereupon, the river split. R’ Pinchas ben Yair then demanded that the river split for another Jew who was carrying wheat for Pesach because he was involved in a mitzvah (Chullin 7a).
The river claimed to be on his way to fulfill the will of Hashem. Where exactly was the river going? Rashi explains that all the rivers in the world flow into the sea because of Hashem’s decree. The river water was on its way to the sea. That was fulfilling the will of Hashem!