Why is Righteousness by Faith Essential for Salvation?

Do we really understand the doctrine of righteousness by faith? Why is the law essential to the righteousness of Christ? What is the relationship between law and grace? The Bible clearly defines righteousness by faith, but there is also a false righteousness by faith which Satan is using to deceive people. We must know the difference between the two if we are to avoid the mistake the Jews made when they rejected Christ their King and chose Caesar instead.

In this video, Professor Walter J. Veith studies what the Bible teaches on justification and compares it with statements Protestants have agreed to in the document Joint Declaration on the Doctrine of Justification.