John Chrysostom
For this reason, the Lord declares. He does not say, "He does this," but rather, "He declares this." Thus far, these are mere words and, if you will, they shall remain words eternally. If He speaks for any purpose, eliminate that purpose. Should anger be an emotion, there would be cause for dread; yet if He speaks, then let that reason be vanquished, and it shall not be uttered. The God of Israel is neither a stranger nor cruel, nor devoid of compassion. Recall the time when Israel was called. Behold, I will provide these people with anguish, and I will give them bitter water to drink. I will turn their lives very bitter; when the soul is in distress, sustenance loses its essence.
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Just as light appears as darkness to the eyes, the sweetest tastes may turn to the most bitter when the essentials are tainted. Therefore, it is not inaccurate to say that the nature of water itself won’t change; rather, as He states, it will bring sorrow, making that which retains its essence appear altered. For those who are ill, sweetness can seem bitter, and to those who grieve even more so.