John 9:4 I must work the works of him that sent me, while it is day: the night cometh, when no man can work.
John 9:5 As long as I am in the world, I am the light of the world.
We are alive. We can still do things. We can share the good things of God, It is still the light of day. When the darkness comes we will not be able to have the here and now of walking in the daylight. There is the darkness of sin, or coming persecution or even illness or death. Can we still now get up and think? Can we share goodness and kindness? Then we are the light of the world. Some may already be in darkness. Bring them the light as Jesus has commanded. "I must work the works of him that sent me, while it is day: the night cometh, when no man can work. "