Where Can I Find Assurance? Part 1

A month or so ago I made the point in this post that confidence in my transformation is not the source of my assurance. Rather, the source of my assurance comes from faith in Christ’s substitution. Assurance never comes from looking at ourselves. It only comes as a consequence of looking to Christ.
As a result, I had a few people raise this question: “But wait a minute…once God saves us and the Spirit begins his renewing work in our lives, shouldn’t that work of inward renewal become a source of our assurance? Isn’t that at least one way we can know we’re right before God?”
At this point we need to be very clear regarding what we’re talking about specifically when we talk about assurance of salvation.
To be sure, the sanctifying work of the Spirit in the life of the Christian bears fruit (Galatians 5:22-23). God grows us in the “grace and knowledge of our Lord Jesus Christ.” In Christ, we have died to sin and been raised to newness of life (Romans 6:4). And this new life shows itself in new affections, new appetites, new habits. We begin to love the  things God loves and hate the things God hates. We begin to grow into our new, resurrected skin.
But when the Bible specifically speaks about assurance, it’s addressing the question, “How then can man be in the right before God?” (Job 25:4). Assurance has to do, in other words, with the conscience’s confidence in ultimate acquittal before God. When we are talking about assurance we are talking about final judgment–what God’s ultimate verdict on us will be. Our assurance depends on how certain we are that God will say at the final judgment: “Not guilty!”
The Bible is plain that God requires moral perfection. It tells us unambiguously that God is holy and therefore cannot tolerate any hint of unholiness. Defects, blemishes, or stains–to the smallest degree–are unacceptable and deserving of God’s wrath. And just in case I’m deluded enough to think that my Spirit-wrought moral improvement since I became a Christian is making the grade, Jesus (in the Sermon on the Mount) intensifies what God’s required perfection entails: “Not only external actions but internal feelings and motives must be absolutely pure. Jesus condemns not only adultery but lust, not only murder but anger–promising the same judgment for both” (Gene Veith).
 In Matthew 5-7, Jesus wants us to see that regardless of how well we think we’re doing or how much better we’re becoming, when “You therefore must be perfect, as your heavenly Father is perfect” becomes the requirement and not “look how much I’ve grown over the years”, we begin to realize that we don’t have a leg to lean on when it comes to answering the question, “How can I stand righteous before God”? Our transformation, our purity, our growth in godliness, our moral advances and spiritual successes–Spirit-animated as it all may be–simply falls short of the sinlessness God demands. And since a “not guilty verdict” depends on sinlessness, assurance is ultimately contingent on perfection, not progress.
So, if God requires perfection and there is no definitive assurance without it (God isn’t grading on a curve, after all), then what hope do I have, imperfect as I am?
The New Testament answer to this question is singular:

For in the gospel a righteousness from God is revealed, a righteousness that is by faith from first to last, just as it is written: “The righteous will live by faith.” (Romans 1:17)
For all have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus, whom God put forward as a propitiation by his blood, to be received by faith. (Romans 3:23-25)
And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness. (Romans 4:5)

Tullian Tchividjian