“You want a sign? You are evil and adulterous.” Jesus has little patience for those who seek entertainment or want him to jump through hoops. Jesus didn’t perform miracles as magic tricks. He didn’t come to fulfil our selfish wants. He came as the Son of God, made flesh to dwell among us.
Whether or not Jonah actually happened, it is still a good example. The Ninevites in the story repented upon hearing Jonah’s preaching, but here is Jesus (who is much greater than Jonah) and the Jews are not repenting. The queen of Sheba also believed after seeing Solomon’s wisdom, but here is Jesus (who is much greater than Solomon was) and the Jews are not repenting.
Do you see signs and refuse to follow them? How will God judge that? You may find the following prayer helpful:
Lord God, you sent your Son Jesus Christ to show us a holy way of living: Grant us grace that we might follow you out of obedience, and that we might put away our pride and false pretenses; through Jesus Christ our Lord. Amen.