2 Tim. 3:14–15. Knowing by whom you have been taught. Moreover, from childhood you have known the sacred Scriptures.
The Apostle Paul presents two motivations for Timothy to remain steadfast: the first is that you, he says, were taught not by chance from just anyone, but from Paul, and this is the same as from Christ; the second is that you were taught not yesterday, but from childhood, and have divine knowledge deeply rooted within you. And it will not allow you to fall into anything unreasonable, as happens with most people. For whoever knows Scripture as one ought will never be led astray. By sacred writings the apostle means all of Divine Scripture. This is directed against Simon and Manes, and all who spoke ill of the Old Testament.
2 Tim. 3:15. Which are able to make you wise unto salvation through faith in Christ Jesus.
External knowledge makes a person clever at deceiving others with various sophisms; hence the ruin of the soul. But divine knowledge is not like this: it makes one wise unto salvation. What kind? Salvation not through works, not through words, but through faith in Jesus Christ. For the Sacred Scriptures lead a person to believe in Christ, Who accomplishes salvation for him.
2 Tim. 3:16. All Scripture is God-breathed and profitable.
Having pointed out many ways of comforting Timothy, the apostle now offers the greatest one as well – in the reading of Holy Scripture. For he intends to communicate to him something sorrowful, namely, that he is finishing his earthly course. So, lest he lose heart as one being deprived of communion with Paul, he says: in place of me you have the Scriptures, which can be profitable to you. Some raise the question: how did the apostle say, "all Scripture is God-breathed"? Are even the Greek writings God-breathed? And being perplexed by its resolution, they translate not "God-breathed," but rather "that which is God-breathed," so that the meaning would be: every writing which is God-breathed is also profitable. But they ought to have taken into account that, having said above, "you know the sacred writings," the apostle now says, "all Scripture." Which? That of which he spoke above and of which he said that it is sacred. Therefore, it is indeed "Scripture God-breathed and profitable" for all that he enumerates further.
2 Tim. 3:16. For doctrine.
It is useful, he says, in that it teaches us what we ought to know. And there is nothing that cannot be resolved by means of Sacred Scripture.
2 Tim. 3:16. For reproof.
If it is necessary to expose a lie, this too can be drawn from here.
2 Tim. 3:16. For correction, for instruction in righteousness.
If it is necessary, he says, to be corrected and to receive instruction, that is, to be brought to one's senses toward righteousness, that is, to act righteously, then the Sacred Scripture provides this to you as well.
2 Tim. 3:17. That the man of God may be perfect.
Correction, he says, comes through Scripture, so that the man who lives according to God may lack nothing good. So if you too desire to become equally well-fitted (artios), that is, perfect, sound, and always even in all things, not despairing in sorrowful circumstances and not becoming proud in favorable ones—for this is characteristic of an uneven disposition of soul—then have Scripture as your counselor instead of me. If the apostle wrote to Timothy, who was filled with the Holy Spirit, about reading, how much more so to us? Note that without Scripture it is impossible to be perfect.
2 Tim. 3:17. Ready for every good work.
Do not simply take part in good works, but be "prepared," that is, completely ready; and not only ready for one thing but not for another, but for every kind.