19 And learn this also, that the soul, before it came into this world, had committed no sin, but having come in sinless, we now sin of our free-will. Listen not, I pray you, to any one perversely interpreting the words, But if I do that which I would not: but remember Him who says, If you be willing, and hearken unto Me, you shall eat the good things of the land: but if you be not willing, neither hearken unto Me, the sword shall devour you, etc.: and again, As you presented your members as servants to uncleanness and to iniquity unto iniquity, even so now present your members as servants to righteousness unto sanctification. Remember also the Scripture, which says, Even as they did not like to retain God in their knowledge: and, That which may be known of God is mani festin them; and again, their eyes they have closed. Also remember how God again accuses them, and says, Yet I planted you a fruitful vine, wholly true: how are you turned to bitterness, thou the strange vine?
Source: Catechetical Lectures (New Advent)