From George MacDonald, Unspoken Sermons, 1867:
Nothing is inexorable but love. Love which will yield to prayer is imperfect and poor. Nor is it then the love that yields, but its alloy . . . For love loves unto purity. Love has ever in view the absolute loveliness of that which it beholds. Where loveliness is incomplete, and love cannot love its fill of loving, it spends itself to make more lovely, that it may love more; it strives for perfection, even that itself may be perfected — not in itself, but in the object . . . Therefore, all that is not beautiful in the beloved, all that comes between and is not of love’s kind, must be destroyed. And our God is a consuming fire.
MacDonald was the inspiration for many of the writings of C.S. Lewis. Fans of The Four Loves will recognize the ideas in this quote.