17 You therefore, beloved, since you know this beforehand, beware lest you also fall from your own steadfastness, being led away with the error of the wicked; 18 but grow in the grace and knowledge of our Lord and Savior Jesus Christ. To Him be the glory both now and forever. Amen (2 Peter 3:17–18, NKJV).
It is essential to see the interdependent relationship between grace and knowledge in today’s passage. Peter’s summary draws attention to the truth his audience already knew (“since you know this beforehand,” v. 17) and warns against falling from their steadfast faith, led away by the error of the lawless. Growing in the “grace and knowledge of our Lord” protects us from being led away by error from the Lord (v. 18). Yes, God’s grace is greater than sin. But we cannot “continue in sin that grace may abound” (Rom. 5:20-6:1). (Grace is not a license to sin by teaching and following error.) Growing in grace is explained in Titus 2:11-14 as denying sin and living “soberly, righteously, and godly in the present age.” So, growing in grace requires us to increase in our knowledge of “the gospel of the grace of God” (Acts 20:24). Good fruit results when we hear, know, and follow “the grace of God in truth” (Col. 1:5-6, 9-11). The gospel is “the word of His grace” that strengthens us and grants us our eternal inheritance (Acts 20:32). Therefore, we are strengthened by God’s grace as we grow in our knowledge of His word (2 Tim. 2:1-2). Grace and knowledge are not opponents. They work together, bringing glory to our Lord and Savior Jesus Christ as they equip us to share in His glory (Col. 3:4).