That is the argument Martin Luther used in “The Bondage of the Will”, however Vico correctly quoted Trent’s answer.
The “will” wills what it desires - it has no desire to resist what it loves, so it is not sinning against its will - it is voluntarily, freely, doing what it loves - that which is, however, missing the mark of loving God.
But, the thing about Jesus and gratuitous Grace is that he appears in the flesh, something new to see by the flesh that can only see humanly present things. He appears to be desirable to a man who cannot see the spiritual, and to be approachable by sinners who can request that He save them. With the presence of Jesus there is suddenly something new in the world to desire by the will that can only see what is in the world.
And Jesus, in the flesh, can baptize them into new life and feed them himself, thus bestowing on them his Spirit, with Sanctifying Grace, with infusion of the light of Virtue, so that now they can see to will and to do good, though with the flesh they still see other pleasures in parallel.