It was a dream at the best. Neither to live together nor to die together could blot out the spiritual limits of friendship. Even in the closest of human relations when two take each other for better for worse, for richer for poorer, in sickness and in health, they may be made one flesh, but never one soul. Singleness is the ultimate fact of human life. "The race is run by one and one, and never by two and two." In religion, in the deepest things of the spirit, these limits we have been considering are perhaps felt most of all. With even a friend who is as one's own soul, we cannot seek to make a spiritual impression, without realizing the constraint of his separate individuality. We cannot break through the barriers of another's distinct existence. If we have ever sought to lead to a higher life another whom we love, we must have been made to feel that it does not all rest with us, that he is a free moral being, and that only by voluntarily yielding his heart and will and life to the King, can he enter the Kingdom. We are forced to respect his personality. We may watch and pray and speak, but we cannot save. There is almost a sort of spiritual indecency in unveiling the naked soul, in attempting to invade the personality of another life. There is sometimes a spiritual vivisection which some attempt in the name of religion, which is immoral. Only holier eyes than ours, only more reverent hands than ours, can deal with the spirit of a man. He is a separate individual, with all the rights of an individual. We may have many points of contact with him, the contact of mind on mind, and heart on heart; we may even have rights over him, the rights of love; but he can at will insulate his life from ours. Here also, as elsewhere when we go deep enough into life, it is God and the single human soul. The lesson of all true living in every sphere is to learn our own limitations. It is the first lesson in art, to work within the essential limitations of the particular art. But in dealing with other lives it is perhaps the hardest of all lessons, to learn, and submit to, our limitations. It is the crowning grace of faith, when we are willing to submit, and to leave those we love in the hands of God, as we leave ourselves. Nowhere else is the limit of friendship so deeply cut as here in the things of the spirit. No man can save his brother's soul, Nor pay his brother's debt.