To obey is better then sacrific

Before the Ten Commandments there were no laws, beside that you should not eat of the tree of good and evil. But it was still sin for Cain to kill Able. God knew it, Cain knew it and God told him, “Then the LORD said to Cain, "Why are you angry? Why is your face downcast? 7 If you do what is right, will you not be accepted? But if you do not do what is right, sin is crouching at your door; it desires to have you, but you must master it." Even though there is no law before the fall there was still a right and wrong and people knew it. So why do you who know the law and have the Word of God at your finger tips not follow it?
You may say the law no longer applies because you are under the new covenant so you don’t have to follow it (Romans 6:14), but when you read on to the next verse Paul shoots that theory down! He says, “What then? Shall we sin because we are not under law but under grace? By no means! Don't you know that when you offer yourselves to someone to obey him as slaves, you are slaves to the one whom you obey—whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness? … You have been set free from sin and have become slaves to righteousness.” (Romans 6:15-16,18) Paul is very clear that we are no longer under the law so that we won’t be condemned by the law, but we are called to obedience to God from whom the law came. The thing that he is trying to get through to the reader is that we are saved by grace and don’t have to worry about our walk with Him being perfect, but that we live by faith. For earlier Paul says this, “For we maintain that a man is justified by faith apart from observing the law” and then “And if by grace, then it is no longer by works; if it were, grace would no longer be grace.” (Romans 3:28;11:6) So it is not that we don’t have to follow the law, but that we cannot be saved by the law. “We then, nullify the law by this faith? Not at all! Rather, we uphold the law.” (Romans 3:28,31)
Paul is not the only one that feels this way either; Peter, James and John all have the same message. Peter says it like this, “Be holy, because I am holy.” (1 Peter1:16 [yeah he quoted it, but he did repeat the scriptures thought]) James puts is this way, “In the same way, faith by itself, if it is not accompanied by action, is dead.” (James 2:17) Then finally John, “Whoever claims to live in him must walk as Jesus did.” (1 John 2:6)
Also Jesus is very clear in the matter. In John 6:29 Jesus answered the people, “The work of God is this: to believe in the one he has sent.” So there is no going to heaven through works, but just to believe in the one whom God sent, Jesus. Then Jesus in John 14:15 says, “If you love me, you will obey what I command.” So what more can be said?
I guess just a conclusion. “For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God— not by works, so that no one can boast.” (Ephesians 2:8-9) God has made the way to heaven free and not something you can earn, but that doesn’t mean that we can forsake the laws laid out for us. It is through the obedience of the laws that we show that we believe what we say we do. (James 2:17) Finally in 1 Samuel 15:22 it says, “But Samuel replied: "Does the LORD delight in burnt offerings and sacrifices as much as in obeying the voice of the LORD ? To obey is better than sacrifice, and to heed is better than the fat of rams.”