Dost thou ever feel thus toward thy neighbour—“Yes, of course, every man is my brother; but how can I be a brother to him so long as he thinks me wrong in what I believe, and so long as I think he wrongs in his opinions the dignity of the truth?” What, I return, has the man no hand to grasp, no eyes into which yours may gaze far deeper than your vaunted intellect can follow? Is there not, I ask, anything in him to love? Who asks you to be of one opinion? It is the Lord who asks you to be of one heart. Does the Lord love the man? Can the Lord love, where there is nothing to love? Are you wiser than he, inasmuch as you perceive impossibility where he has failed to discover it? Or will you say, “Let the Lord love where he pleases: I will love where I please”? or say, and imagine you yield, “Well, I suppose I must, and therefore I will,—but with certain reservations, politely quiet in my own heart”? Or wilt thou say none of all these things, but do them all, one after the other, in the secret chambers of thy proud spirit? If you delight to condemn, you are a wounder, a divider of the oneness of Christ. If you pride yourself on your loftier vision, and are haughty to your neighbour, you are yourself a division and have reason to ask: “Am I a particle of the body at all?” The Master will deal with thee upon the score. Let it humble thee to know that thy dearest opinion, the one thou dost worship as if it, and not God, were thy Saviour, this very opinion thou art doomed to change, for it cannot possibly be right, if it work in thee for death and not for life.
George MacDonald, A Dish of Orts, "A Sermon"