We can say this, because through Christ we feel certain before God.
We are not saying that we can do this work ourselves. It is God who makes us able to do all that we do.
He made us able to be servants of a new agreement from himself to his people. This new agreement is not a written law, but it is of the Spirit. The written law brings death, but the Spirit gives life.
The law that brought death was written in words on stone. It came with God's glory, which made Moses' face so bright that the Israelites could not continue to look at it. But that glory later disappeared.
So surely the new way that brings the Spirit has even more glory.
If the law that judged people guilty of sin had glory, surely the new way that makes people right with God has much greater glory.
That old law had glory, but it really loses its glory when it is compared to the much greater glory of this new way.
If that law which disappeared came with glory, then this new way which continues forever has much greater glory.
We have this hope, so we are very bold.
We are not like Moses, who put a covering over his face so the Israelites would not see it. The glory was disappearing, and Moses did not want them to see it end.
But their minds were closed, and even today that same covering hides the meaning when they read the old agreement. That covering is taken away only through Christ.