I believe that if we really want human brotherhood to spread and increase until it makes life safe and sane, we must also be certain that there is no one true faith or path by which it may spread. But it is not easy to banish the notion that there can be universal brotherhood just as soon as everybody gives up his faith and accepts ours. That day may never come, for the richness of human diversity cannot be abolished any more than Mars or Jupiter. Difference is the nature of life, it is part of our moral Universe. Without difference, life would become lifeless.