Isaiah was fearless enough to tell that the Lord had said, “I was found by people who were not looking for me. I appeared to the ones who were not asking about me.”
Now the LORD says to me, “It isn't enough for you to be merely my servant. You must do more than lead back survivors from the tribes of Israel. I have placed you here as a light for other nations; you must take my saving power to everyone on earth.”
My servant will make nations worthy to worship me; kings will be silent as they bow in wonder. They will see and think about things they have never seen or thought about before.
What does all this mean? It means that the Gentiles were not trying to be acceptable to God, but they found that he would accept them if they had faith.
It also means that the people of Israel were not acceptable to God. And why not? It was because they were trying to be acceptable by obeying the Law instead of by having faith in God. The people of Israel fell over the stone that makes people stumble,