Sheryl and Annie, you've both nailed it. Let me also add that the "Rock of Ages" that GL talks about also is likely the Protestant image of Jesus (building on, not negating, the original Jewish scripture that Sheryl cited). One of the best-known hymns to many Protestants is "Rock of Ages"; the first verse goes like this:
Rock of Ages, cleft for me,
Let me hide myself in thee.
Let the water and the blood
From thy wounded side which flowed
Be of sin the double cure:
Save from wrath and make me pure.
If you're interested, it's easy to look up the rest of the verses. I agree with Annie that it's sort of an informal conversation with the deity, perhaps a mid-life contemplation (he would have been just over 40 when he wrote it) examining the nature of God (got no ego, got no pride, etc.), salvation (are we bound for the promised land? are we bound for eternity?), and the giving over of oneself (I am yours, you belong to me...let me do what I can, for my future is in your hands...). It's a song that's been on my mind lately, took awhile to grow on me, but I really like it now.
Best wishes,
DQ
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