Even though it is true that doers of the law are justified by the law, there is no one justified other than Jesus that was actually justified by the law so, you are a hearer of the law only, because you failed to do it, and you can't use Jesus as an excuse for a "do over." On the other hand, I'm a doer of the word (the promise). That is, I believe it! And receive my inheritance without the requirement to do the law, the avenue you'd rather take to obtain your inheritance, which only ONE has ever done.
For if the inheritance depends on the law, then it no longer depends on a promise; but God freely granted it to Abraham through a promise.-Galatians 3:18