I believe that the chorus goes (with probable mistakes): "I have come from the darkness to the light, To the light of redemption from sin, O my soul doth rejoice in His might, For my Saviour dwells within." I'm surprised that I can't find the lyrics on-line.

I am searching for the words to a hymn that begins "I have come from the darkness to the light of the Lord, I have come from the night to the day." The melody is very familiar, so I was stunned to find that it did not exist in any of the hymn books I have used in the past 30 years.