Jesus continues his response to those who ask for a sign from heaven (16).
First, he uses the similitude and proverb in verse 33. Jesus would give no sign to them to show that he was the Messiah at this time because it would do no good. Jesus preached and did works openly, not in secret. The light is already shining brightly and they choose to remain in the dark.
The blessed who hear the word of God and obey it, as stated in verse 28 come to him, see the light, and believe. Blessed are those who see, believe, practice, and share the light with others.
Second, Jesus uses the parable in verses 34 to 36 to say their problem is with their eyes. Though it receives the light it chooses not to see it. What the eyes see, if we choose to accept it will affect our whole being. If when we see Jesus and accept the light of truth the power of the Holy Spirit will enter our soul and we will be whole.
What the eye is to the body, so the soul (the mind, will, and affections) is to the whole person. If those who asked for a sign from heaven will only regard His work and teaching without prejudice, then their own consciences will testify that Jesus has a real mission from God.
Look around and consider carefully what is seen. For soon the light will be no more, the sun will set and your day will be over.
