Religion becomes sinful when it begins to advocate the segregation of God, to forget that the true sanctuary has no walls. Religion has always suffered from the tendency to become an end in itself, to seclude the holy, to become parochial, self-indulgent, self-seeking; as if the task were not to ennoble human nature but to enhance the power and beauty of its institutions or to enlarge the body of doctrines.
- Abraham Joshua Heschel