I've read enough of the Bible to back the things I say.
I suggest that you do read the entire Bible, in context, to appreciate the scriptures on their own merit. If you did, you would know answers to questions like "What, or rather who is the source of spiritual light?" For those who read the entire Bible, there is no need to guess: we know the Gospel of John tells us many times the Light is the Word, who is Jesus Christ (quotations are from the New Jerusalem Bible):
A man came, sent by God. His name was John.  He came as a witness, to bear witness to the light, so that everyone might believe through him.  He was not the light, he was to bear witness to the light. The Word was the real light that gives light to everyone; he was coming into the world. John 1:6-9
When Jesus spoke to the people again, he said: I am the light of the world; anyone who follows me will not be walking in the dark, but will have the light of life. John 8:12
As long as I am in the world I am the light of the world. John 9:5
I have come into the world as light, to prevent anyone who believes in me from staying in the dark any more. John 12:46
If we seek the light, where does the Bible say we should look: to the Lord, or to a 19th century publishing company in Brooklyn?