"On the other hand, works and deeds are the plan and system of God that functioned under the Mosaic Law. Matt 5:16, "Let your light shine before men, that they may see your good works, and glorify your Father which is in heaven." Jesus was talking to the Jews and the Jews only. And in the Sermon on the Mount in Matt chapters 5-7, Jesus was talking about the Mosaic Law. And the Mosaic Law was only operational in the Dispensation of Israel. Rom 9:4 says, "The people of Israel, theirs is the adoption as sons; theirs the divine glory, the covenants, THE RECEIVING OF THE LAW, the temple worship, and the promises."
(2). Grace is the system whereby man cannot be blessed by what he does, but can only be blessed by what God has done through Jesus Christ. Rom 5:1-2, "Therefore, since we have been justified (made righteous) through faith, we have peace with God through our Lord Jesus Christ, through whom we have gained access by faith INTO THIS GRACE IN WHICH WE NOW STAND." We do not stand under the law, we stand in grace. Rom 6:14 tells us very clearly that "...you are not under law, but you are under grace." Rom 7:6, "...we have been released from the law so that we can serve in the new way of the Spirit, (the law of the filling of the Holy Spirit) and not in the old way of the written code." (The written code is the Mosaic Law). Rom 11:5-6, "...at the present time there is a remnant chosen by grace. And if by grace, then it is no longer by works; if it were, grace would no longer be grace." Gal 2:16, "...no one will be justified (made righteous) by observing the law." Gal 3:11-12, "...the righteous will live by faith. The law is not based on faith."
(3). The Mosaic Law was the teacher in the past. It taught the Jews the plan of God through object lessons. It taught them what the work of Jesus Christ would involve. It was actually designed to bring them to Christ. Gal 3:24-25, "The law was our schoolmaster to bring us to Christ so that we might be justified (made righteous) by faith. Now that faith has come, we no longer need the schoolmaster." Rom 2:20 tells us that it was "through the law that we become aware of sin." In other words, it was the law that taught people what was right and wrong. The law was a teacher. But it is very important to know and understand that the law was only a teacher, it could not save anyone. It was designed to show the total depravity of mankind and cause man to look toward the Savior, Jesus Christ."