“If you over-contextualize and compromise the actual content of the gospel, you will draw a crowd but no one will be changed. That is nothing less than a dereliction of the preacher’s duty. You will mainly just be confirming people in their present course of life. On the other hand, if you under-contextualize, so that your communication of the gospel is unnecessarily culturally alien and distant from the listeners, you will find that no one will be willing to hear you out.” (pp. 102–03)
Keller, Timothy. Preaching: Communicating Faith in an Age of Skepticism. Penguin Books, 2016.