Old Testament Law Abolished

Romans 6:14-15

Romans 6:14 For sin shall not have dominion over you: for ye are not under the law, but under grace.

6:15 What then? shall we sin, because we are not under the law, but under grace? God forbid.
[KJV]

This is a very straightforward statement: "for ye are not under the law, but under grace". Paul clearly stated that Christians are not under the law, we are saved by grace. However, just because Christians are not under the law, that doesn't mean that we can sin freely. We are to be led by the Spirit.