Gerhard and Walther

The restoration of the image of God and the renewal of our nature is not perfect in this life, but sin in the flesh is still continually present in the reborn and renewed people. By the power of the Spirit, they must strive against this, stifle it, and kill it off in order that they may not be overcome by it and become stuck into the former yoke of sin.—Johann Gerhard, Schola Pietatis, I:201.

Even the natural man, who has no aversion to sinning, finds it extraordinarily repulsive to listen to someone who talk only about himself, his good qualities, his great deeds and riches, his skills and wisdom, and even his godliness.—C. F. W. Walther, God Grant It!, p. 221.