"What is undivided love? Love which shows no special favour to those who love us in return. When we love those who love us, our brethren, our nation, our friends, yes, and even our own congregation, we are no better than the heathen and the publicans. Such love is ordinary and natural, and not distinctively Christian. We can love our kith and kin, our fellow countrymen and our friends, whether we are Christians or not, and there is no need for Jesus to teach us that. But he takes that kind of love for granted, and in contrast asserts that we must love our enemies. Thus he shows us what he means by love, and the attitude we must display toward it."
- Dietrich Bonhoeffer ("The Cost of Discipleship")