In this Gospel reading of Luke, Jesus is speaking to the crowd of people about Jonah, the prophet to the Ninevites. He compares Jonah’s message to that of his own, saying that as Jonah was a sign to the Ninevites, the Son of Man will be that sign to the current generation. But, even so, Jesus says that something greater than Jonah is in their midst, meaning himself as the Son of God.
We today almost always believe that we need some kind of sign to prove we are doing the right thing. But this Lent, each of us should remind ourselves of the fact that this sign that we are looking for is always Christ, and that He is the “something greater” that we know is always there.