We've been saved by Grace through faith in Christ, why did God published the law in the Bible?

ROMANS 8:1 tells us "There is therefore no more condemnation to those who dwell in Christ Jesus because the law of the Spirit has set us free from the law of sin and death. For what the law couldn't achieve because of man's sinful nature, God did by sending His only Son (Jesus) in the likeness of sinful flesh on account of sin. He thus condemned sin in human nature so that the law's requirements may be achieved by us who behave not in a fleshly but spiritual way."

Some Christians contend that the law must not be preached because it contradicts God's very purpose of salvation by grace and not by law. But it was God Himself who placed the law in the Holy Scriptures and we cannot question His purpose for doing so. If God didn't want the law to be known, He shouldn't have published it in the first place. I believe in what the bible says that the law cannot save us. In fact it can only condemn us. Clearly, through the law, we can better appreciate the saving grace of God. That we need God's mercy and forgiveness because we cannot save ourselves by following the law which we cannot do to the letter in the first place.

Even if we have been saved by Grace, there was one "new commandment" which God wants us to follow. It is the commandment "to love one another." The Bible says "he who has love has obeyed all the commandments. Isn't that logical? If you love a person, you will never kill or hurt him or steel from him or covet his wife or do him any harm. We in the process obey all of God's 10 commandments and more. The Bible tells us also that He prefers obedience from his children and not sacrifice.

I see God's Grace therefore as the enablement for us to follow God's will. Following God's will without Grace is not possible.
Jesus Christ is the only way, and there is no other way to salvation. Even people without religion are capable of doing charitable works but all these endeavors amount to nothing without relations to the living God through Jesus Christ. Jesus Christ said "I am the ressurection and the life. He who believes in me will live even though he dies (physically); and whoever lives and believes in me will never die." (John 11:25-26.