An evil and rebellious generation seek after a sign. Although many look for some supernatural sign to be the proof of God, they readily admit that there can be no such thing. For they would immediately seek to explain it in physical terms. And if, indeed, it did appear in reality as we know it, the sign could be observed, tested, and scrutinized by science which would remove all mystery to the event and it would cease to be understood as supernatural. If they couldn’t explain it, they would point to a lack of appropriate technology and predict that an answer would appear at a later time. The contradiction is readily apparent, though, when it becomes understood that the call for a sign is the call for mystery and the supernatural, to be able to genuinely witness it. So, they expect to see mystery and then explain it away thereby undoing the mystery. In the end, the call for a sign is a challenge to God to present something for man to reject.