What is involved in being a Jew? Duties of the heart, not only external performance; the ability to experience the suffering of others, compassion and acts of kindness; sanctification of time, not the mere observance of customs and ceremonies; the joy of discipline, not the pleasures of conceit; sacrifice, not casual celebrations; contrition rather than national pride.

Abraham Joshua Heschel, Moral Grandeur and Spiritual Audacity by Abraham Joshua Heschel, Susannah Heschel, editor