Albert Barnes Commentary John 9:5

"When I am in the world, I am the light of the world." — John 9:5 (ASV)

As long as I am in the world. As the sun is the natural light of the world, even while it sinks away to the west, so am I, although my days are drawing to a close, the light of the spiritual world.

What a sublime description this is! Jesus occupied the same place, filled the same space, and shed his beams as far, in the moral world, as the sun does on natural objects;

And as all is dark when that sun sinks to the west, so when he withdraws from human souls, all is midnight and gloom.

When we look on the sun in the firmament or in the west, let us remember that such is the great Sun of Righteousness in regard to our souls. His shining is as necessary, and his beams as mild and lovely on the soul, as is the shining of the natural sun to illumine the material creation. (See Barnes on John 1:4).