Sun of the Soul is from a 1917 Southern gospel song by Curtis Williams titled "When the Lights Have gone Out In Your Soul."

It was first recorded in 1927 by Ernest Phipps and his Congregation for Victor "If the Lights Gone Out of Your Soul." Peer probably knew about the Phipps recording and let the Carters record the song with a different title, a common practice to avoid copyright and royalty issues. teh Carters made their version in 1932.

THE SUN OF THE SOUL- Carter Family 1932

               When the sun of your life has gone down
               And the clouds in the west turn to gold
               Endless death will to you then have come
               If the light has gone out in your soul

                   Oh, just think how in death you would feel
                   With the light growing dim in your soul
                   Oh, how lonely it will be, oh, how still
                   If the light has gone out in your soul
                   [INSTRUMENTAL BREAK]

               When you come to the end of the way
               And life's story for you has been told
               Oh, how sad all to you will appear
               If the light has gone out in your soul

                   Oh, just think how in death you would feel
                   With the light growing dim in your soul
                   Oh, how lonely it will be, oh, how still
                   If the light has gone out in your soul
                   [INSTRUMENTAL BREAK]

               When the chilly winds of death around you steal
               And the sweat upon your brow is damp and cold
               What a dread in your life you would feel
               If the light has gone out in your soul

               When before the judgement bier you shall stand
               And your deeds of you have been trolled
               Good and evil appears, oh, what then
               If the light has gone out in your soul
                   Oh, just think how in death you would feel
                   With the light growing dim in your soul
                   Oh, how lonely it will be, oh, how still
                   If the light has gone out in your soul