The basis for the ethics of the Sermon on the Mount is not what works but rather the way God is. Cheek-turning is not advocated as what works (it usually does not), but advocated because this is the way God is - God is kind to the ungrateful and the selfish. This is not a stratagem for getting what we want but the only manner of life available, now that, in Jesus, we have seen what God wants. We seek reconciliation with the neighbor, not because we feel so much better afterward, but because reconciliation is what God is doing in the world through Christ.
Stanley HauerwasConsider the problem of taking showers with Christians. They are, after all, constantly going on about the business of witnessing in the hopes of making converts to their God and church. Would you want to shower with such people? You never know when they might try to baptize you.
Stanley HauerwasIn the Crusades, getting the Holy Land back was the goal, and any means could be used to achieve it. World War II was a crusade. The firebombing of Tokyo by Doolittle and the carpet bombing in Germany, especially by the British, showed that.
Stanley Hauerwas