Love is the light of their world.

The eternal rapture of Angels comes from the faculty that God communicates to them to render back to Him the joy they feel through Him.

This reciprocity of infinitude forms their life.

They become infinite by participating of the essence of God, who generates Himself by Himself.
"The immensity of the Heavens where the Angels dwell is such that if man were endowed with sight as rapid as the darting of light from the sun to the earth, and if he gazed throughout eternity, his eyes could not reach the horizon, nor find an end.

Light alone can give an idea of the joys of heaven.