Only a fraction of the present body of professing Christians are solidly appropriating the justifying work of Christ in their lives. Many have so light an apprehension of God's holiness and of the extent of the guilt of their sin that consciously they see little need for justification, though below the surface of their lives they are deeply guilt-ridden and insecure. Many others have a theoretical commitment to this doctrine (of justification through imputed righteousness) but in their day-to-day existence they rely on their sanctification for their justification, in the Augustinian manner, drawing their assurance of acceptance with God from their sincerity, their experience of conversion, their recent religious performance or the relative infrequency of their conscious, willful disobedience.
Few know enough to start each day with a thoroughgoing stand upon Luther's platform; you are accepted, looking outward in faith and claiming the wholly alien righteousness of Christ as the only ground for acceptance, relaxing in that quality of trust which will produce increasing sanctification as faith is active in love and gratitude.
Richard Lovelace - Dynamics Of Spiritual Life, pg 101