The reason why this article doesn't address "proper motive for following the Law and a benefit to it" is because the born again Christian is NOT under the bondage of the Law. The Law was fulfilled in Christ....and He has redeemed us from the CURSE (not benefit) of the Law
(Galatians 3:13; 4:4-5).
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Here are more excerpts from that same article:
What Does the Old Testament Law Require? Galatians 3:10 speaks of a two-fold requirement:
(1) continual obedience
(2) obedience in all things. (
Deuteronomy 11:22; 27:26; James 2:10). This is why no man can have righteousness through the law; as sinners we cannot fulfill its high demands.
What the Old Testament Law Cannot Do:
(1) It cannot justify
(Acts 13:38-39; Galatians 2:16).
(2) It cannot redeem
(Romans 3:24-31; Galatians 3:13-14).
(3) It cannot give an inheritance
(Romans 4:13-14).
(4) It cannot control sin in man
(Romans 7:7-23; 8:2).
(5) It cannot free from sin and death
(Romans 8:2).
(6) It cannot free a sinner from condemnation
(Romans 8:1-4).
(7) It cannot bring righteousness
(Romans 8:4).
(8) It cannot impart the Holy Spirit
(Galatians 3:2).
(9) It cannot free from the curse
(Galatians 3:10,14).
(10) It cannot impart grace
(Galatians 5:4).
(11) It cannot enable a man to obey
(Hebrews 7:18).
(12) It cannot make perfect
(Hebrews 7:19).
The Old Testament Law Was a Temporary Covenant:
(1) It was given to prepare Israel for the coming of Christ
(Galatians 3:19-25).
(2) It is abolished with Christ's coming
(2 Corinthians 3:6-17).
(3) It was taken away when Christ died
(Colossians 2:14-17).
What Was the Law's Purpose?
(1) It was given to reveal sin and to show man that he is a guilty sinner before God
(Romans 3:19-20; 7:12-13; 1 Timothy 1:9-10).
(2) It was given to bring men to Jesus Christ
(Galatians 3:24-25).
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Show me the "benefits" of keeping the Old Testament Law.
As believers living under grace we need to have our minds baptized and immersed in the
EPISTLES, becoming more and more familiar with the great GRACE-ORIENTED COMMANDS that are found therein. Yes we are certainly to obey God’s commands, but the commands which God has given to us are
based upon the believer’s glorious position in a crucified and risen Christ. These commands do not flow out of Mount Sinai, they flow out of Mount Calvary.