People are far more open to discussing ethics than to discussing theistic proofs or even ‘transcendental arguments’. Philosophy does not excite many people today, and many do not even want to hear personal testimony and the simple gospel. But they do care about right and wrong. Christians who can talk about ethics in cogent way, therefore, have a great apologetic and evangelistic advantage.
John Frame. The Doctrine of the Christian Life. P & R: Philippsburg 2010. (5)