'..if no one is thoroughly unredeemable but the devil alone, and if the two cities are intermingled until the final judgement, then the Christian will be predisposed to expect any and every aspect of human culture to contain some mixture of good and evil, beauty and ugliness, truth and falsehood, and will refuse to give absolute allegiance to any human ideology, value, or institution. That refusal and the affirmation of God on which it rests give the Christian a wonderfully open but critical mind to engage with culture in all its diversity. In other words, if we begin and end with a black and white antithesis (God and creation, city of God and earthly city) we find many fine shades of grey in between.'
Christopher Watkin, Critical Thinking: How the Bible's Unfolding Story Makes Sense of Modern Life and Culture, p.20.
