2:13 I had no rest in my spirit - From an earnest desire to know how my letter had been received. Because I did not find Titus - In his return from you. So I went forth into Macedonia - Where being much nearer, I might more easily be informed concerning you. The apostle resumes the thread of his discourse, 2Cor 7:2, interposing an admirable digression concerning what he had done and suffered elsewhere, the profit of which he by this means derives to the Corinthians also; and as a prelude to his apology against the false apostles.

2 Corinthians 2:13 Parallel Commentaries

Epistle xxxv. To Leontius, Ex-Consul.
To Leontius, Ex-Consul. Gregory to Leontius, &c. Since in a great house there are not only vessels of gold and of silver, but also of wood and of earth, and some indeed to honour but some to dishonour (2 Tim. ii. 20), who can be ignorant that in the bosom of the Universal Church some as vessels of dishonour are deputed to the lowest uses, but others, as vessels of honour, are fitted for clean uses. And yet it commonly comes to pass that the citizens of Babylon serve in task-work for Jerusalem, while …
Saint Gregory the Great—the Epistles of Saint Gregory the Great

How the Rude in Sacred Learning, and those who are Learned but not Humble, are to be Admonished.
(Admonition 25.) Differently to be admonished are those who do not understand aright the words of the sacred Law, and those who understand them indeed aright, but speak them not humbly. For those who understand not aright the words of sacred Law are to be admonished to consider that they turn for themselves a most wholesome drought of wine into a cup of poison, and with a medicinal knife inflict on themselves a mortal wound, when they destroy in themselves what was sound by that whereby they ought, …
Leo the Great—Writings of Leo the Great

The Preparatory Service; Sometimes Called the Confessional Service.
In our examination of the nature and meaning of the Lord's Supper, we have found that it is indeed a most important and holy Sacrament. It is in fact the most sacred of all the ordinances of the Church on earth. There is nothing beyond it--nothing so heavenly, on this side heaven, as this Feast. Nowhere else does the believer approach so near to heaven as when he stands or kneels, as a communicant at this altar, the Holy of Holies in the Church of Christ. What a solemn act! To approach this altar, …
G. H. Gerberding—The Way of Salvation in the Lutheran Church