Behold, the Lord God helps me;
who will declare me guilty?
Behold, all of them will wear out like a garment;
the moth will eat them up.
The confidence that comes in the salvation that God brings is an amazing work of God's grace. It is the message that Isaiah is bringing to Israel in this passage. Although they would experience a time of judgment for their disbelief, God would restore them as they returned to Him. God would continue to keep His covenant. He would love them. He would help them. He would save them.
And when God saves us, helps us, and forgives us, who else could condemn us? The answer is clear: nobody. God removes our guilt and nobody else can bring it back. No person can declare guilty someone whom God has forgiven and set free. Their accusations are temporal while God's forgiveness is eternal. They will all wear out and fade away. They will crumble like moth eaten cloth.
The stuff of this world fades and falters. It degenerates. It may consume my thinking sometimes until I stop and contemplate Your great grace. Then I realize You have helped my soul at my greatest need. And that is really all I need to know. When You forgive me no other accusation can stand against me. I am thankful for such grace.