"When the Pharisees heard that Jesus had arrived, they came and started to argue with him. Testing him, they demanded that he show them a miraculous sign from heaven to prove his authority. When he heard this, he sighed deeply from his spirit and said, 'Why do these people keep demanding a miraculous proof like this? Amen I say to you, I will not give this generation any such sign.' So he got back into the boat and left them, and crossed to the other side of the lake." Mark 8:11-13
