2 Corinthians 1:12

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.

This verse is Paul's affirmation of total sincerity and godliness in all of his dealings with the Corinthians. He gloried in the fact of the absolute integrity and uprightness of his behavior among them. He had not indulged in the tricks and devices of "fleshly wisdom." His actions were open before God and themselves; there were no hidden deeds of darkness and dishonesty on his part.