It is crucial in the fight for joy that we not confuse or combine justification and sanctification. Confusing them will, in the end, undermine the gospel and turn justification by faith into justification by performance. If that happens, the great gospel weapon in the fight for joy will fall from our hands.
– Piper, John; When I Don’t Desire God: How to Fight for Joy; copyright 2004; Crossway Books; Wheaton, Il.; p. 84