John Chrysostom
Indeed, immoderate sorrow is dangerous. It is dangerous and can lead to death. Therefore Paul also said: "lest such a one be swallowed up with too much sorrow" (2 Cor 2:7). From this also they received no small consolation, learning that He knew the excess of their sorrow. They were in extreme distress from fear of separation from Him and from expectation of the afflictions about to befall them. They did not know whether they would have strength to endure them courageously. But why did He not tell them this later, when they had already been counted worthy of the Spirit? So that you may know that they were very virtuous.
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If, before they were counted worthy of the Spirit, they did not fall away, though they were plunged in sorrow, then consider what they were to become once they had received grace. If they had heard and endured then, we would have attributed everything to the Spirit. But now this is entirely the fruit of their soul and a clear proof of their love for Christ, flowing from their own heart.