By John Newton: Slave Ship Captain turned Christian and author of Amazing Grace:

Shortened Cooley Paraphrase: I am not what I will be, but I’m not what I was.

Normally Used Quote: “I am not what I ought to be, I am not what I want to be, I am not what I hope to be in another world; but still I am not what I once used to be, and by the grace of God I am what I am”

Full Quote: “I am not what I ought to be. Ah! How imperfect and deficient! I am not what I wish to be. I abhor what is evil, and I would cleave to what is good. I am not what I hope to be. Soon, soon, I shall put off mortality, and with mortality all sin and imperfection. Yet, though I am not what I ought to be, nor what I wish to be, nor what I hope to be, I can truly say, I am not what I once was—a slave to sin and Satan. And I can heartily join with the apostle, and acknowledge, ‘By the grace of God, I am what I am.’”
— Quoted in John Whitecross, The Shorter Catechism Illustrated (Edinburgh: Banner of Truth, 1968), question 35.