He also learns what the actions and sacrifice of his master was meant to accomplish. He also listens to what the Holy Spirit which the master sent to inspire the apostles to write said. Something that those who attempt to put us back under the law entirely fail to understand.
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The author of the above demonstrates an understanding of nothing!
The apostles all wrote that "doers of the law will be justified."
They did not write that doers of the law will be justified by the law.
Nobody ever was or will be justified by the law.
Doers of the law will be justified because earnestly and obediently following the commandments is what leads to genuine righteousness. It makes his disciples “righteous as he is righteous.” That is why the law is called “instruction in righteousness,” and “the perfect law of liberty.” “ For this is the love of God, that we keep his commandments: and his commandments are not grievous.”
That is what the Holy Spirit inspired the apostles to write.
Deliberately manipulating and inverting the message of Acts 15 will cost many dearly.
And the "doers of the Law shall be justified" Rm. 2:13) actually refers to Gentiles who "do by nature the things contained in the law," (v. 14) obviously not the ceremonial aspects but the basic moral law which Gentles went against in Rm 1 in idolatry and sodomy, and other moral sins.
And the reason such doers shall be justified is because being a "doer of the Law" is a characteristic of saving faith which is counted for righteousness, and which effects "what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh: That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. (Romans 8:3-4)
And the righteousness of the law is fulfilled via the NT realities which the ceremonial law represented.