I am not the man I ought to be,
I am not the man I wish to be
and I am not the man I hope to be,
but by the grace of God, I am not the man I used to be.
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Gender-inclusive version:

I am not the person I ought to be,
I am not the person I wish to be
and I am not the person I hope to be,
but by the grace of God, I am not the person I used to be.