On Feb. 10, we lost a gadol (a great leader). The world was blessed for more than 80 years (1931-2013) with the presence of a hero of Torah, a progressive force for good, a religious pluralist, and an astounding teacher of ethics and spirituality. Rabbi David Hartman was my teacher and the rebbe of thousands around the world. His reach extended from secular Israelis to religious Israelis, from Reform through Orthodox, from the young to the elderly, from the homeland to the diaspora. He was a Rabbi’s rabbi, a philosopher for philosophers, and a teacher for teachers.