"Even after conversion, the believer is in desperate need of the Gospel because he reads the commands, exhortations, threats, and warnings of the Law and often wavers in his certain confidence because he does not see in himself this righteousness that is required. Am I really surrendered? Have I truly yielded in every area of my life? What if I have not experienced the same things that other Christians regard as normative? Do I really possess the Holy Spirit? What if I fall into serious sin?
These are questions that we all face in our own lives. What will restore our peace and hope in the face of such questions? The Reformers, with the prophets and apostles, were convinced that only the Gospel could bring such comfort to the struggling Christian.
Without this constant emphasis in preaching, one can never truly worship or serve God in liberty, for his gaze will always be fastened on himself--either in despair or self-righteousness--rather than on Christ." -Michael Horton