Often, the mystery of how we grow as Christians baffles us. There are some Christians who say, “God takes care of all the work. Those commands in the Bible simply show you that you can’t do them and need Jesus.” Others say, “No, you gotta clench your fists and get to work. God gets this rolling, but you need to seal the deal.”

I think both of those approaches to sanctification are wrong.

If we are going to be ruthlessly biblical however, we are going to see grace and effort working together. We are going to see that Paul is adamant that Christians need to strive, but all of their striving is by God’s power and grace. Earlier this week, I spent a devotional time in 1 Thessalonians 5:12-24, where this idea is extremely clear:

12 We ask you, brothers, to respect those who labor among you and are over you in the Lord and admonish you, 13 and to esteem them very highly in love because of their work. Be at peace among yourselves.14 And we urge you, brothers, admonish the idle, encourage the fainthearted, help the weak, be patient with them all. 15 See that no one repays anyone evil for evil, but always seek to do good to one another and to everyone. 16 Rejoice always, 17 pray without ceasing, 18 give thanks in all circumstances; for this is the will of God in Christ Jesus for you. 19 Do not quench the Spirit. 20 Do not despise prophecies, 21 but test everything; hold fast what is good. 22 Abstain from every form of evil.

23 Now may the God of peace himself sanctify you completely, and may your whole spirit and soul and body be kept blameless at the coming of our Lord Jesus Christ. 24 He who calls you is faithful; he will surely do it.

In one breath, Paul can command the Thessalonians to “be at peace,” “admonish,” “rejoice,” and “do not quench.” In the next breath he can say, “Now may God sanctify you completely.” How can he do this?

Paul understands that, at bottom, the Thessalonians will grow in holiness only by God’s grace. He also understands that his teaching, exhorting, and commanding are the God ordained means to accomplish what God wants in the Thessalonians. So yes, God is sovereignly working for the holiness of the Thessalonians (and us). On the other side of the coin, people have to actually do something. As John Piper has said, Christians have to act the miracle of sanctification. And who gets the credit for that acting? God. Therefore, it is not legalism for Paul to give a command, and it is not legalism for us to do so either.

Paul is clear that Jesus delivers from the wrath to come (1:10). He delivers through his perfect obedience and substitutionary death. The only proper response to being rescued by Jesus is love, joy, thanksgiving, abstaining from evil, devotion, and obedience. John Stott once wrote, “To teach the standards of moral conduct which adorn the gospel is neither legalism nor pharisaism but plain apostolic Christianity.” Those who have been saved by grace will respond with obedience. They will not obey perfectly, of course, and that is why salvation is all of grace. It is only by the grace of God that our soul and body will be kept blameless when Jesus returns (5:23). That is why Paul prays in verses 23-24, “Now may the God of peace himself sanctify you!” We do the acting, but God is the one causing the acting to happen in such a way that he gets the glory and ensures that we will arrive at the end the way he intended.

So what’s the difference for you and me? If someone asked me, “If you seek to do some act of obedience even though you don’t want to do it, isn’t that the definition of legalism?” my answer would be, “No, because my theology is right.” That might sound like a snarky answer, but think about it.  If I believe my rejoicing in God (one of Paul’s commands above) merits love from God, then yes, it is legalism. But consider an alternative. I strive to rejoice in God even when I don’t feel like it. I do it not to earn God’s love because I realize I am already loved in Christ through the gospel. No amount of rejoicing will earn more of God’s favor I already have. Instead, I know rejoicing in God is what God deserves in light of the gospel and that only rejoicing in him will bring true joy. I ask God to help me strive. I confess my apathy and laziness. I recognize that Christ is the treasure and some other comfort has subdued his rightful place in my heart. I realize that through my striving, God is working in me to kill idolatry, laziness, apathy, self-pity, etc. in order to find true happiness in him. Only when I strive this way is my striving not legalism but proper response to God’s grace in the gospel. 

And that kind of striving, my friends, is a miracle. It is a gift of grace, and that makes it all the more beautiful, lovely, and exciting. I want this for myself, and you. May God be gracious to do it!

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