"The Father is light, the Logos is light, and the Holy Spirit is light..."

The Hospitality of Abraham and the Mystery of the Holy Trinity (source)

  
The Father is light, the Logos is light, and the Holy Spirit is light, which was sent down upon the Apostles as fiery tongues, and through Whom the whole world is enlightened to worship the Holy Trinity.
-Exaposteilarion of the Feast of Pentecost
  
(source)
  

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!