In Matthew 12:38-45, Jesus finishes his interaction with the Pharisees by responding to their demand for a sign, to prove whether or not He was the Son of David. Jesus says no sign will be given, except the sign of Jonah. This is as close as Jesus will get to lying, because He has given them loads of signs, but they refuse to see. This message deals with the idea of what it takes to believe, and what it takes to disbelieve, including the misuse of evidence and logic.