John Chrysostom

Then he describes his trials and temptations, not to depress his disciple, but to elevate him, that if he should ever fall into the same, he may not think it strange, when he looks back and remembers what things happened to his Teacher. What then says he? …

Homily on 2 Timothy 3 ↗

Theophylact of Ohrid

The Apostle points to the temptations, not in order to strike the disciple, but to more fully persuade him — so that, in the event that he himself should undergo similar temptations, he would not think that he was experiencing anything extraordinary, but would bear them calmly. After the Apostle was taken into custody by Nero, all the Asians abandoned him, that is, the people from the Asian provinces who were living in Rome.

Commentary on 2 Timothy ↗

Oecumenius

You know this, that all who are in Asia have turned away from me, among whom are Phygellus and Hermogenes. Paul is tested not to be overcome, but to teach endurance in similar trials. For when he was arrested by Nero, his friends in Asia abandoned him. There were many in Rome from Asia who followed Paul or were otherwise faithful. But all of them distanced themselves after his arrest by Nero. that all who are in Asia. That is, those from Asia.

Commentary On 2 Timothy ↗

Thomas Aquinas

Then when he says, you know this, he shows why it was necessary to give this admonition, both because some are slackening and some are progressing. For when a person sees some of his associates making progress and others slowing down, he strives to imitate the good ones: first, therefore, he reminds him that some are slowing up; second, that some are making progress, at the Lord gives mercy. Therefore, he tells him what to avoid to keep out of danger: he that thinks himself to stand, let him take heed, lest he fall (1 Cor 10:12). …

Commentary on 2 Timothy ↗