The Scribes & Pharisees asked for a sign, but in reality they were looking for reasons to doubt. They had already seen many amazing signs, but none of the were enough. If you are looking for reasons to believe you will find them, because they are there. If you are looking for reasons to doubt, you will find them because you will set the bar wherever you want, move it as you see fit, & refuse true submission to God until you deem God has earned it from you. News flash; God owes you nothing but wrath & has given you every pleasure you have ever enjoyed. Repent of your obstinance and be saved! Rejoice in the sign of the prophet Jonah; Jesus rose from the dead! What other proof could we need?!