John Chrysostom
I will place My hand upon you, and I will refine you into purity. This reveals that while God's wrath and discipline may be severe, they are not solely for the purpose of retribution; rather, they are intended for the betterment of the one being chastised. As He has declared, I will remove your impurities and kindle you into purity. Hence, we should not mourn when we face discipline, but rather when we sin, as sin breeds defilement, while discipline leads to cleansing. What does it mean to be pure? It signifies that no remnant of impurity lingers within you. Just as fire refines gold, so punishment is meant for the careless. Yet, I will eliminate those who rebel, eradicate all lawlessness among you, and bring low the proud.
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Those who are irrevocably ill and remain unrestrained even under punishment shall face destruction. What value is their existence if they cause harm to themselves and others throughout their lives? Conversely, those who can be molded by their trials will endure. Here, I believe there is also a suggestion of captivity. I will eradicate those who disobey, take away all lawlessness from you, and humble the arrogant. Those who are so deeply wounded that they cannot be corrected by discipline will perish. What good is their life if they inflict pain upon themselves and others? However, those capable of transformation through their suffering will remain.