Whoever does not stand in this constant battle of flesh and spirit, knowing grace in his mind but not in his heart, is devoid of all spiritual life. If he does not fight against sinful impulses, sin will continue to rule over him, rending him from him. To such a person, eternal death is already adjudged, and he can only abandon the sweet dream that he stands in God’s grace. As Paul says, “For if you live according to the flesh you will die” (Romans 8:13).
God Grant It: Daily Devotions from C. F. W. Walther p 613