John Chrysostom
Another translator, Symmachus, remarks that they spoke one thing in their hearts and something entirely different. The prophet refers to two forms of deceit: speaking vanity and speaking to their neighbor. By “vanity,” he indicates either deceitfulness or superfluous and unhelpful words. Paul echoes this sentiment when he instructs to ‘speak no lies one to another’ (Colossians 3:9). It is especially troubling that everyone is tainted. He did not specify certain individuals, but rather declared that ‘every one’ is affected. The wrongdoing is not merely an external issue; it also lies within the heart: ‘of the heart, and of the heart,’ or alternatively, as another translator conveys, in the heart of one person and another, hinting at significant duplicity present in their hearts.
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This internal treachery is more severe than any external foes. There are clear and overt adversaries, which can be easily defended against, but there also exist those who outwardly present themselves in one way yet harbor another intention within, making them difficult to identify and far more perilous than those who openly bear arms.