1. The sign of Jonah (29-32)

Jesus called his generation wicked for asking for a sign to prove that he was from God (16). Jesus promised only the sign of Jonah. This could refer to Jesus' coming from death to resurrected life, as Jonah came out of the fish's mouth (see Mt 12:40). Yet Luke seems to emphasize people repenting after being preached to, just like the Ninevites' response to Jonah's warning (Jonah 3:4-5). Jesus' audience was worse than the Ninevites and the Queen of the South (1Ki 10:1,8). We don't need a sign; we need to repent and seek wisdom.

2. The lamp of the body (33-36)

Light is meant to be lifted high to shine on all. The word of God is a light (Ps 119:105). Jesus is the light of the world (Jn 8:12). To confess our sins is to walk in the light (1Jn 1:6-9). Healthy, generous eyes come from accepting Jesus by repentance and faith. We let the light of God in by believing in Jesus and his word. Unhealthy, stingy eyes reject Jesus and remain in darkness.