The thing that struck me about this question was the differance between the Jews of Christ's time and that of Abraham. Abraham, although using the law that God have him, did so out of faith and love of his God and creator. The Jews of Christ's time, it appears to me, had forgotten that and had relied completely on the law to justify thier salvation. Abraham's love and faith produced works through love. To me that is where the justification comes in. When we produce acts of love and kindness to another through our faith, hope and love of Jesus Christ as our personal savior.
Mik3