You that make your boast of the law, through breaking the law do you dishonor God?
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The breaker of the law is the one who overlooks the meaning of the law, which speaks of the incarnation and divinity of Christ, and dishonors God by not accepting the testimony which he gave concerning his Son. For the Father said: “This is my beloved Son.” Commentary on Paul’s Epistles.
If we prefer a life of pleasure to the life of obedience to the commandments, how can we expect a life of blessedness, fellowship with the saints and the delights of the angelic company in the presence of Christ? Such expectations are truly the fantasies of a foolish mind. The Long Rules, Preface.
Here Paul makes two, or rather three, accusations. First, that they dishonor. Second, that they dishonor that by which they were honored. Third, that they dishonor the One who honored them, which was the depth of ingratitude. And then, so as not to appear to be accusing them off his own bat, he brings in the prophet Isaiah as their accuser.