Os Guinness, from his book,
Prophetic Untimeliness: A Challenge to the Idol of Relevance (p. 15):
By our uncritical pursuit of relevance we have actually courted irrelevance; by our breathless chase after relevance without a matching commitment to faithfulness, we have become not only unfaithful but irrelevant; by our determined efforts to redefine ourselves in ways that are more compelling to the modern world than are faithful to Christ, we have lost not only our identity but our authority and our relevance. Our crying need is to be faithful as well as relevant.