The mystery of Jesus: For as Jonah was a sign to the Ninevites, so also will the Son of Man be to this generation. Luke 11:30

Jesus according to the gospel of Luke while he was preaching the spiritual doctrine of the Kingdom of God on earth was a mystery to most people, in fact his disciples could only understand many of the explanations of their teacher when they received the Holy Spirit at Pentecost, particularly the teachings about the seven I Ams and the Son of Man. As Jesus demonstrated with his words and actions, human reason is insufficient to reach the truth of God, and Jesus knew that; that is why Jesus constantly encouraged his disciples to open their hearts and not to be led by the hardness of the heart.
And it happened that many who approached Jesus were skeptical about his true identity and constantly asked him to do a sign, and that annoyed Jesus, because in a certain sense that meant tempting God, Jesus strongly condemned this type of people for their lack of faith and fear of God (constancy, firmness, devotion, and equanimity).
That is why according to the Gospel of Luke, the Lord, after beginning his journey to Jerusalem and having finished praying, referred to those who followed him simply out of spiritual curiosity and without any intention of committing to his words, and with these words he did so: "As the crowds increased, Jesus said, ´This is a wicked generation. It asks for a sign, but none will be given it except the sign of Jonah. For as Jonah was a sign to the Ninevites, so also will the Son of Man be to this generation" Luke 11:29-30.
With this teaching Jesus referred to the figure of Jonah to explain many things, Jonah was a prophet who was sent by God to the worst place in the world, Nineveh, the capital of the Assyrian empire; the Ninevites were in the times of the prophets famous for their cruelty and their contempt for other peoples and Jonah was sent to preach and thus save the city from the wrath of God. Jonah, faced with this request from God, logically wanted to escape and was punished by God by being swallowed by a large fish, in which he remained for three days, and was finally vomited out.
Jesus, with his teaching, anticipated that just as Jonah was three days in the belly of a fish, he would also be three days in the tomb before being resurrected. The resurrection, that is, reviving to never die again, is for Christians the most important sign or mystery in the life of Jesus.

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