When we truly understand grace—when we see that God only owes us wrath but has provided Christ’s merit to cover our demerit—then everything changes. The Christian motivation for ethics is not merely to obey some abstract law or a list of rules; rather, our response is provoked by gratitude. Jesus understood that when He said, “If you love Me, keep My commandments.” If I may have the liberty to paraphrase: “Keep My commandments not because you want to be just, but because you love Me.” A true understanding of grace—of God’s unmerited favor—always provokes a life of gratitude and obedience.

A number of decades ago at the Ligonier Valley Study Center, we sent out a Thanksgiving card with this simple statement: “The essence of theology is grace; the essence of Christian ethics is gratitude.” In all the debates about our role versus God’s role in sanctification—our growth in holiness—we’d stay on the right track if we’d remember this grace-gratitude dynamic. The more we understand how kind God has been to us and the more we are overcome by His mercy, the more we are inclined to love Him and to serve Him.

Yet we can’t get the grace-gratitude dynamic right if we aren’t clear on what grace means. What is grace? The catechisms many of us learned as children give us the answer: “Grace is the unmerited favor of God.” The first thing that we understand about grace is what it’s not—it’s not something we merit. In fact, if that is all we ever understand about grace, I’m sure God will rejoice that we know His grace is unmerited. So, here’s our working definition of grace—it is unmerit.

Paul’s epistle to the Romans sheds light on what we mean when we say that grace is unmerit. In 1:18–3:20, the Apostle explains that on the final day, for the first time in our lives, we will be judged in total perfection, in total fairness, in absolute righteousness. Thus, every mouth will be stopped when we stand before the tribunal of God. This should provoke fear in the hearts of fallen people, as condemnation is the only possible sentence for sinful men and women: “All have sinned and fall short of the glory of God” (3:23).

But those who trust in Christ Jesus have hope, for if we are in Him by faith, we have been “justified freely by His grace.” Note that justification is accomplished not by obligation, but freely through grace on account of the redemption purchased by Jesus alone. There’s no room for boasting, for we are justified not by our works but by grace alone through faith alone. Paul goes on to cite Abraham as the preeminent example of one who was justified by faith alone and therefore free from God’s sentence of condemnation.

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