Our Gratitude: The Ten Commandments as a Guide for Christian Life

Part Three opens with Q. 86: ‘Since we have been delivered from our misery by grace alone through Christ, without any merit of ours, why must we yet do good works?’ The answer reframes the entire moral life: good works are not the condition of salvation but the consequence of it. They flow from gratitude, not from fear.

The Third Use of the Law

The catechism’s treatment of the Ten Commandments reflects the law’s third use: as a guide for sanctified living. Having shown in Part One that the law reveals our sin, it now shows in Part Three that the same law — received in a new spirit — guides the redeemed person’s grateful response to grace. This is not legalism; it is the law fulfilled from the inside by the Holy Spirit.

Beyond the Letter

One of the most striking features is how expansively the catechism reads the commandments. Q. 107, on ‘You shall not murder,’ asks: ‘Is it enough that we do not kill our neighbor?’ No — when God forbids anger and envy, He commands love, patience, mercy, and kindness, even toward enemies. The catechism consistently moves from prohibition to positive obligation, following Jesus’s own teaching in the Sermon on the Mount.