So what is required for us to be conformed to the image of Christ is not simply some small adjustments or behavioral modifications, but nothing less than renovation from the inside. We need to be regenerated, to be made over again, to be quickened by the power of the Spirit. The only way in which a person can escape this radical situation is by the Holy Spirit’s changing the core, the heart. However, even that change does not instantly vanquish sin. The complete elimination of sin awaits our glorification in heaven.
The doctrine of total depravity reflects the Reformed viewpoint of original sin. That term—original sin—is often misunderstood in the popular arena. Some people assume that the term original sin must refer to the first sin—the original transgression that we’ve all copied in many different ways in our own lives, that is, the first sin of Adam and Eve. But that’s not what original sin has referred to historically in the church. Rather, the doctrine of original sin defines the consequences to the human race because of that first sin.
Virtually every church historically that has a creed or a confession has agreed that something very serious happened to the human race as a result of the first sin—that first sin resulted in original sin. That is, as a result of the sin of Adam and Eve, the entire human race fell, and our nature as human beings since the fall has been influenced by the power of evil. As David declared in the Old Testament, “Oh, God, I was born in sin, and in sin did my mother conceive me” (Ps. 51:5). He was not saying that it was sinful for his mother to have borne children; neither was he saying that he had done something evil by being born. Rather, he was acknowledging the human condition of fallenness—that condition that was part of the experience of his parents, a condition that he himself brought into this world. Therefore, original sin has to do with the fallen nature of mankind. The idea is that we are not sinners because we sin, but that we sin because we are sinners.
In the Reformed tradition, total depravity does not mean utter depravity.