Even as the testimony of Christ was confirmed in you:
According as the testimony of (of and concerning) Christ (who is both the object and author of this testimony) (1 Corinthians 2:1; 1 Timothy 2:6; 2 Timothy 1:8) was confirmed among you - i:e., by God, through my preaching, and through the miracles accompanying it (1 Corinthians 12:4; Hebrews 2:4). Or better, as the English version, God confirmed (cf. Hebrews 2:3), or gave effect to, the Gospel in the Corinthians, by their accepting it, and setting their seal to its truth, through the inward power of His Spirit, and the outward miracles accompanying it.