Doubt. Little by little it gnaws away at the soul. Now to be sure, there are times when Christianity seems to make all the sense in the world—when the mysteries of the faith appear so certain that it would be foolish even to call them into question, and yet there are also times when we have our doubts. Dr. Philip Ryken answers the question, "How can I know for sure?" on Every Last Word.
Those who are in Christ have been justified before God. But salvation means much more; it means that we are sanctified, that God actually leads us into holiness. As Michael Allen and company explain, our holiness is carried out in the present work of our sovereign, loving God. In Christ we are given life, not simply in name, but in fact. Praise the Lord, who delivers His children through every weakness. Though you struggle with sin, do not be discouraged; it is God who works in you, "both to will and to work for his good pleasure" (Phil. 2:13).