Looking for proof

¹¹ The Pharisees showed up and began to argue with Jesus. To test him, they asked for a sign from heaven. ¹² With an impatient sigh, Jesus said, “ Why does this generation look for a sign? I assure you that no sign will be given to it. ” ¹³ Leaving them, he got back in the boat and crossed to the other side of the lake.