John Chrysostom
A disciple at sea receives great courage when his teacher has suffered shipwreck and been saved. He no longer thinks that storms attack him because of his own lack of skill, but because of the natural order of things. This greatly helps sustain courage.
Likewise, it encourages a commander of a detachment in war when he sees that his general remains courageous after being wounded.
So too it is a consolation for believers that the Apostle endured many misfortunes and did not lose heart from any of them. Otherwise, if this were not so, Paul would not have spoken of his sufferings.
Timothy hears that his teacher, who accomplished so much and conquered the whole world, is in chains and afflictions, abandoned by his own, yet does not complain or grow indignant.
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When Timothy himself undergoes the same misfortunes, he will not ascribe what happened to human weakness, nor to being a disciple and less than Paul. For the teacher also suffered the same things, according to the natural order of things.
For this reason the Apostle acted thus. For this reason he speaks at length about all this, to encourage and strengthen Timothy.
With this aim, after recounting his afflictions and temptations, he continues: “Be strengthened, my son, in the grace that is in Christ Jesus.” What are you saying?
You have struck us with fear. You have said that you are bound, that you are in afflictions, that all have abandoned you. Then, as though you had said that you had suffered no misfortune and had been abandoned by no one, you add: “Be strengthened, my son.”
And rightly so, for the former can encourage you far more than the latter. Indeed, if I, Paul, endure such misfortunes, then much more must you endure them. If the teacher suffers, how much more the disciple.
He offers this exhortation to Timothy with great love, calling him “son,” and not simply that, but “my son.” If, he says, you are a son, imitate your father.
If you are a son, be strengthened by what I have said. Yet not by my words only, but by the grace of God: “Be strengthened, my son, in the grace that is in Christ Jesus,” that is, by the grace of Christ.
Stand courageously. You know the battle order. So also elsewhere, explaining that “our wrestling is not against flesh and blood” (Eph 6:12), he says this not to terrify his hearers, but to encourage them.
Therefore be sober, he says, and watch. The grace of the Lord struggles and works together with you. Yet you also must fulfill your work with complete readiness and eagerness.