John Chrysostom
After offering Timothy many exhortations and consolations of every kind, Paul adds the most perfect consolation, that from the Scriptures.
He does not offer so many consolations without cause. He was about to say something important and sorrowful.
If Elisha, who remained with his teacher until the last moment of his life, tore his garments when he saw him end his earthly life in an extraordinary manner, what must Timothy have felt?
He was so loved and loved so much. He heard that his teacher was preparing to die and saw himself deprived of his face near the time of his death. This usually causes the greatest sorrow.
We are not so grateful for past time if we were separated from the departed near the time of their death.
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For this reason Paul first offers Timothy many consolations, and only then speaks to him of his approaching departure. He does not speak simply, but uses expressions able to console and fill him with joy.
He presents the event more as a sacrifice than as death, and more as a departure, as indeed it was, and as a passage to something better. “For I am already,” he says, “being poured out as a libation” (2 Tim 4:6).
Therefore he writes here: “All Scripture is God-inspired and profitable for teaching, for reproof, for correction, for instruction.”
“All,” which Scripture? The one about which, he says, I have spoken, every sacred Scripture. Here he means the Scripture spoken of above, about which he said: “from childhood you have known the sacred writings.”
Therefore every sacred Scripture is God-inspired. So, he says, do not doubt it at all.
“For teaching.” If it is necessary to learn something, or if perplexity arises about something, we can learn about it from here.
If it is necessary to expose falsehood, or if it is necessary to be corrected or instructed, this too we can draw from here. It also helps toward exhortation and consolation.
“For correction,” that is, if something is lacking and something must be supplied.