For he sent letters into all the king's provinces, into every province according to the writing thereof, and to every people after their language, that every man should bear rule in his own house, and that it should be published according to the language of every people. That every man should bear rule in his own house - Both God's law and common sense taught this from the foundation of the world. And is it possible that this did not obtain in the Persian empire, previously to this edict? The twentieth verse has another clause, That all wives shall give to their husbands honor, both to great and small. This also was universally understood. This law did nothing. I suppose the parade of enactment was only made to deprive honest Vashti of her crown. The Targum adds, "That each woman should speak the language of her husband." If she were even a foreigner, she should be obliged to learn and speak the language of the king. Perhaps there might be some common sense in this, as it would oblige the foreigner to devote much time to study and improvement; and, consequently, to make her a better woman, and a better wife. But there is no proof that this was a part of the decree. But there are so many additions to this book in the principal versions, that we know not what might have made a part of it originally.
Commentary on the Bible, by Adam Clarke [1831].