Just because we sin everyday does not mean we throw away the law and gives up... Jesus literally told us to not think he came to abolish the law but magnify the law. You don't understand Paul. Even Paul literally said that Romans 3:31 do we, then, nullify the law by this faith? Not at all! Rather, we uphold the law.
I take Jesus word over Paul's words wouldn't you? Especially when 2 Peter 3:16-18 warns us the Paul is difficult to understand which ignorant and unstable people twist to lawlessness (paraphrasing)