A favorite story of the Rebbe, central to his activist view of life: Rabbi Schneur Zalman of Liadi, the first rebbe of the Lubavitch dynasty, led the services for Yom Kippur, the holiest day of the year. He stood wrapped in his prayer shawl, profoundly entranced in the cleaving of his soul to its origin in the Infinite Light. Every word of prayer he uttered was fire. His melody and fervor carried the entire community off to the highest and the deepest journey of the spirit. And then he stopped. He turned, cast off his prayer shawl and left the synagogue. With a bewildered congregation chasing behind, he walked briskly to the outskirts...