2 Corinthians 13:5

ἑαυτοὺς πειράζετε κ. τ. λ.: try your own selves (πειράζειν generally has a sinister sense in the N.T. = “to tempt,” as at 1 Corinthians 7:5; 1 Corinthians 10:9; Galatians 6:1; 1 Thessalonians 3:5; but see reff.) whether ye be in the Faith, sc., the objective Christian Creed (cf. 1 Corinthians 16:13); prove your own selves (δοκιμάζειν goes back to δοκιμή of 2 Corinthians 13:3; cf. also ἀδόκιμοι at the end of this verse). Or know ye not as to your own selves that Jesus Christ is in you? (cf. Romans 8:10; Galatians 4:19) unless indeed, sc., which is certainly not the case (for εἰ μή τι cf. Luke 9:13; 1 Corinthians 7:5) ye are reprobate. ἀδόκιμος is that which will not satisfy a test, and so = reprobus. Their own consciousness of the power of Christ's grace is the best proof that his preaching to them was Divinely authorised; he “begat them in Christ Jesus” (1 Corinthians 4:15).