"He is near that justifieth me; who will contend with me? let us stand together: who is mine adversary? let him come near to me. Behold, the Lord GOD will help me; who is he that shall condemn me? lo, they all shall wax old as a garment; the moth shall eat them up.” (Isaiah 50:8-9)
Knowing that God was there to direct him and care for him Christ had no fear of what his opposition would succeed, and Isaiah had similar confidence in God. Any who stood against him or against Christ would eventually be destroyed just as a piece of clothing will eventually wear out and be discarded. While the prophecy is primarily about Christ, Isaiah is being used as the example to illustrate what would happen to Christ.