O gracious Light
Pure brightness of the everlasting Father in heaven,
O Jesus Christ, holy and blessed!
Now as we come to the setting of the sun,
And our eyes behold the vesper light,
We sing praises, O God: Father, Son and Holy Spirit.
You are worthy at all times to be praised by happy voices,
O Son of God, O giver of life,
And to be glorified through all the worlds. [Amen]
~ Phos Hilaron

This is attributed by some to the martyr and bishop Athenogenes (d. c. 305), who is said by tradition to have sung this hymn (“O Cheerful Light”) as he was burned for his faith.

I John 1:5 ~ This is the message we have heard from him and proclaim to you, that God is light, and in him is no darkness at all.

John 8:12 ~ Again Jesus spoke to them, saying, “I am the light of the world. Whoever follows me will not walk in darkness, but will have the light of life.”

I Peter 2:9 ~ But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light.

Revelation 22:5 ~ And night will be no more. They will need no light of lamp or sun, for the Lord God will be their light, and they will reign forever and ever.