Theophylact of Ohrid, on 1Thess 4:9

“But as touching the charity of brotherhood, we have no need to write to you: for yourselves have learned of God to love one another.”

“The Apostle no longer speaks of love toward all, but of love toward the brethren. By the very omission he already exhorts, achieving two purposes: first, this matter is so necessary that there is no need even to learn it, for everyone knows that it holds particular importance for all. Second, by this he admonishes them all the more, urging them not to fall below the opinion he had of them, considering them already corrected. See how he praises them, saying that God Himself teaches them this virtue. The prophet also said the same thing: "they shall all be taught by God" (Isa. 54:13; Jer. 31:34).”

Imported from an open dataset — not yet checked against the printed edition.