Eliyahu – who formerly accuses Benei Yisrael of forsaking the covenant with God, causing a rift in the course of the generations – is responsible for the healing of this very rift.  It is he who connects the generations together and unifies them, with a single heart, to return to God. His presence at every circumcision as well as at every Seder table, where fathers fulfill the commandment to recount the events of the Exodus to their children, is in preparation for and anticipation of his great mission of restoring the hearts of fathers to children, and the hearts of children to their fathers. 

Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion