Nuke_em_05 said:
Romans Chapter 6 is in regard to the idea that people would keep sinning because one sin would condemn you. It is a kind-of a counter to the slippery slope or "anything worth doing" idea. Because you are under grace doesn't mean you can do what you want.
Matthew 5:17-20: 17 "Do not think that I came to abolish the Law or the Prophets; I did not come to abolish but to fulfill. 18 "For truly I say to you, until heaven and earth pass away, not the smallest letter or stroke shall pass from the Law until all is accomplished. 19 "Whoever then annuls one of the least of these commandments, and teaches others to do the same, shall be called least in the kingdom of heaven; but whoever keeps and teaches them, he shall be called great in the kingdom of heaven. 20 "For I say to you that unless your righteousness surpasses that of the scribes and Pharisees, you will not enter the kingdom of heaven."
Just so you know, that's Jesus talking. The law still applies, but grace covers us. That doesn't mean we keep sinning because we have grace.
First, I never said you can do what you want.
Second, you should have kept reading Romans 6:
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? But thanks be to God that, though you used to be slaves to sin, you wholeheartedly obeyed the form of teaching to which you were entrusted. You have been set free from sin and have become slaves to righteousness
Being under grace isn't a freedom to do what you want, it's a freedom the the law (Which is impossible to fulfill), and it's a freedom from sin (Which the author of Romans points out leads to death). The impossibility of the law is shown by the last verse you provided:
"For I say to you that unless your righteousness surpasses that of the scribes and Pharisees, you will not enter the kingdom of heaven." The Pharisees were the epitome of the law. Everything literally acted out according to the law. Christ is saying we have to be better then them if we are following the law, but we aren't. We are under grace. You're right in that Christ fulfilled it, thus we are under that grace, not the law.