That's the verse that throws Catholics off...They don't buy into the idea that they are wretches...
We are aware of our sinful human nature, and that we are saved by "grace alone."
"Amazing Grace" is a beautiful but doctrinally flawed song, and is not inspired Scripture.
The term "wretch" suggests Calvin's doctrine of "total depravity," which is contrary to Church Teaching.
We believe:
CCC 405. Although it is proper to each individual, original sin does not have the character of a personal fault in any of Adam’s descendants. It is a deprivation of original holiness and justice, but human nature has not been totally corrupted: it is wounded in the natural powers proper to it, subject to ignorance, suffering, and the dominion of death, and inclined to sin — an inclination to evil that is called “concupiscence.” Baptism, by imparting the life of Christ’s grace, erases original sin and turns a man back towards God, but the consequences for nature, weakened and inclined to evil, persist in man and summon him to spiritual battle.