" But justification does not refer to this renewing and sanctifying grace of God. It is one of the primary errors of the Romish Church that it regards justification as the infusion of grace, as renewal and sanctification whereby we are made holy. And the seriousness of the Romish error is not so much that it has confused justification and renewal but that it has confused these two distinct acts of God’s grace and eliminated from the message of the gospel the great truth of free and full justification by grace. That is why Luther endured such travail of soul as long as he was governed by Romish distortion, and the reason why he came to enjoy such exultant joy and confident assurance was that he had been emancipated from the chains by which Rome had bound him; he found the great truth that justification is something entirely different from what Rome had taught. "

― John Murray , Redemption Accomplished and Applied