But first I will tell you what is written in the Book of Truth. (No one supports me against them except Michael, your prince.
NIV
But I will tell you what is inscribed in the writing of truth or the Book of Truth. There is no one who holds with me and strengthens himself against these [hostile spirit forces] except Michael, your prince [national guardian angel].
AMP
But I will shew thee that which is noted in the scripture of truth: and there is none that holdeth with me in these things, but Michael your prince.
KJV
Now this is our boast: Our conscience testifies that we have conducted ourselves in the world, and especially in our relations with you, with integrity and godly sincerity. We have done so, relying not on worldly wisdom but on God's grace.
NIV
It is a reason for pride and exultation to which our conscience testifies that we have conducted ourselves in the world [generally] and especially toward you, with devout and pure motives and godly sincerity, not in fleshly wisdom but by the grace of God (the unmerited favor and merciful kindness by which God, exerting His holy influence upon souls, turns them to Christ, and keeps, strengthens, and increases them in Christian virtues).
AMP
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.
KJV