Self-examination is not easy nor always pleasant. But Christians must do so to confirm our faith and assure our hope in Christ. The doctrine that a Christian cannot fall from God’s grace and be lost is patently false (Gal. 5:4; Heb. 2:1-3; 3:12-14; 2 Pet. 2:20-22). In today’s text, the exhortation warns of being disqualified (“unapproved, rejected,” castaway, reprobate, G96). Paul himself was not immune to the possibility of being disqualified (1 Cor. 9:27). He uses two words in today’s text to urge us to avoid being rejected by the Lord. To prevent such spiritual disaster, we must (1) Examine ourselves. We must expend effort to test and scrutinize ourselves, to explore our conduct and our heart’s motives, attitudes, and aspirations that prompt our actions. The standard we examine ourselves against is “the faith,” the gospel of Christ (Gal. 1:11, 23; Jude 3). Do the heart and behavior align with the word of Christ? (2) Test ourselves. This word means to discern whether we are approved. Vine says it means “to prove with a view to approving” (Vine, II:22). We must discern whether our assessment shows “that Jesus Christ is in” us. If it does, then good. Keep it up. If it shows we are deficient, repent and practice righteousness (2 Cor. 12:20-21; Rev. 2:5). Christians use the gospel to examine (inspect) and test (approve) ourselves. By conforming to it, we know (recognize) ourselves and are accepted by Christ.
3 Beloved, while I was very diligent to write to you concerning our common salvation, I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints. 4 For certain men have crept in unnoticed, who long ago were marked out for this condemnation, ungodly men, who turn the grace of our God into lewdness and deny the only Lord God and our Lord Jesus Christ. (Jude 3–4, NKJV)
Jude calls upon at least two incentives to urge Christians to agonize intensely (“contend earnestly”) for the faith (the gospel, Gal. 1:11, 23). First, it is because of the gospel that we share a common salvation (Rom. 1:16-17). And next, because God has delivered the faith to us with finality (“once for all”). Precisely because the gospel is powerful to save us, and because God has fully delivered this powerful gospel to us, we must fight for it against all who would attempt to dilute its power and impugn its adequacy to save us (see verse 4). To reject the gospel’s salvation and its fullness of grace brings one under the condemnation of the ungodly. Instead, let us give our full strength and energy to guarding and advancing the truth of the gospel.