Every human love, at its height, has a tendency to claim for itself a divine authority. Its voice tends to sound as if it were the will of God Himself. It tells us not to count the cost, it demands of us a total commitment, it attempts to over-ride all other claims and insinuates that any action which I sincerely done “for love’s sake” is thereby lawful and even meritorious. That erotic love and love of one’s country may tus attempt to “become gods” is generally recognized. But family affection may do the same. So, in a different way, may friendship.
CS Lewis
The Four Loves