Enlightening The Sign of Jonah (Luke

The crowd is seeking signs, challenging their demand for proof, but Christ says they will receive the “sign of Jonah.” Jonah was the sign to Ninevah so Christ is the sign for the current generation.
Then Jesus shifts to a metaphor of light and vision. The problem isn’t the light (the gospel) but the eye (our spiritual perception). If our “eye” is healthy, we’ll see clearly and live in the light. If not, we’re plunged into darkness.
So, we are not to demand signs but to see the Gospel as the sufficient light pointing us to Christ. We are to have a singular focus on the kingdom. As we are focused on the Lord’s kingdom, his light will continue to conform. Ultimately, it is the call to give ourselves to the Spirit, the sole source of light and life.