For this is our boast: Our conscience testifies that we have conducted ourselves in the world, and especially in relation to you, in the holiness and sincerity that are from God—not in worldly wisdom, but in the grace of God.
KJV
For our rejoicing is this, the testimony of our conscience, that in simplicity and godly sincerity, not with fleshly wisdom, but by the grace of God, we have had our conversation in the world, and more abundantly to you-ward.
ASV
For our glorying is this, the testimony of our conscience, that in holiness and sincerity of God, not in fleshly wisdom but in the grace of God, we behaved ourselves in the world, and more abundantly to you-ward.