MASNAVI II:1286;1290-3

THE SENSUOUS eye is a horse,
And the light of God is the rider:
Without the rider the horse is useless.
The light of God rides the sensuous eye.
And then the soul yearns for God.
How can a riderless horse
Recognize the signs of the road?
God’s light enhances the senses:
This is the meaning of “light upon light.”