"For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof." (Hebrews 7:18 KJV)
"Dear brothers and sisters, here's an example from everyday life. Just as no one can set aside or amend an irrevocable agreement, so it is in this case. God gave the promises to Abraham and his child. And notice that the Scripture doesn't say "to his children," as if it meant many descendants. Rather, it says "to his child" - and that, of course, means Christ. This is what I am trying to say: The agreement God made with Abraham could not be canceled 430 years later when God gave the law to Moses. God would be breaking his promise. For if the inheritance could be received by keeping the law, then it would not be the result of accepting God's promise. But God graciously gave to Abraham as a promise." (Galatians 3:15-18 NLT)
This is where many people, even those who are very religious, tend to mess up. There are sincere people who believe that the law was given to make us obedient, as it was in my life, all my time growing up. I can still remember opening the Family Bible to the two pages that had the "Ten Commandments," on the two pages, in the center of the Bible; and they were shown to be written on stone tablets.
What those stone tablets meant to be, was that they couldn't be broken, as if this was God's word which had been written in stone. Much like my mom would sometimes say, "My words are written in stone, so you better not forget it." As it was, I ended up being quite a rebel; basically, because I knew that I simply could not stop from breaking God's commands, which were much harder than that of my mother's.
By the time I was eleven I had my first arrest, which was really not my fault. But my second arrest, a few months later, was absolutely my fault, and I ended up in the slammer. From that time on, until I turned eight-teen and was planning to go into the Navy, I was on probation, which ended up with me going in and out of several different facilities.
When I was in the eighth grade, at the age of 13, I was excluded from the San Bernardino School District. That is a little worse that being expelled, because it meant we had to more to a different county. So we ended up moving to L.A. and I was told to try and be better. Well, that didn't work out so well, because I ended up being worse.
As far as I was concerned, I was most likely an enemy of God, so what the point of trying to be good! If I couldn't keep God's law and requirements, then why bother! I just did whatever I wanted and just didn't care where I might have ended up. Actually, the slammer sometimes felt more like home, than my home felt; my mother was always drinking and was seldom home.
Anywho, this is something that is really important, and we must make very certain that it is clearly understood: We cannot keep God's law! No matter how hard we might try, it is totally impossible for us to keep those Ten Commandments!
The promise God made to Abraham was not canceled when God gave to law to Moses, 450 years after He had given the promise: He gave the law to show us that we were broken and needed to be saved...
"Why then, was the law given? It was given alongside the promise to show people their sins. But the law was designed to last only until the coming of the child who was promised. God gave the law through Moses, who was the mediator between God and the people. Now a mediator is helpful if more than one party must reach an agreement. But God, who is the one, did not use a mediator when he gave the promise to Abraham. Is there a conflict, then, between God's law and God's promises? Absolutely not! If the law could give us new life, we could be made right with God by obeying it. But the Scriptures declare that we are all prisoners of sin, so we receive God's promise of freedom only by believing in Jesus Christ." (Galatians 3:19-22 NLT)