John Chrysostom

"But I beseech you the rather to do this, that I may be restored to you the sooner." His thus praying was the act of one who loved them greatly, and that not simply, but with all earnestness, that so, he says, I may come to you speedily. The earnest desire to come to them is the mark of one conscious to himself of nothing wrong, also the entreating them to pray for him.

Homily on Hebrews 34 ↗

Theophylact of Ohrid

To wish them so warmly and with all care to pray that he might return to them sooner — this came from his strong love for them. At the same time, he shows that he relies on his conscience, and therefore appeals to them. He would not have done this if he had felt anything bad in his conscience.

Commentary on Hebrews ↗

Oecumenius

"I urge you to do this more sincerely." What is this? To pray for us. This was something they greatly loved, to want to pray for them sincerely and with all diligence, so that they might quickly be restored. "in order that I may be restored to you sooner." This was said because Paul had a good conscience, wanting to persuade them in person; which he would not have done if he were aware of any wrongdoing in himself.

The Pseudo-Oecumenian Catena on Hebrews ↗

Thomas Aquinas

Then (v. 19) he gives another reason why they should pray for him, namely, because this will benefit them. Therefore, I urge you the more earnestly to do this, i.e., to pray, because it will profit you: 'I long to see you that I may impart to you some spiritual grace' (Rom. 1:11). …

Commentary on Hebrews ↗