Oecumenius

I am, he says, the Alpha and the Omega, the first and the last, the beginning and the end. These things have been sufficiently said above; therefore now pass on.

Commentary on Revelation ↗

Cyprian

That in this sign of the Cross is salvation for all people who are marked on their foreheads. In Ezekiel the Lord says: "Pass through the midst of Jerusalem, and thou shalt mark the sign I upon the men's foreheads, who groan and grieve for the iniquities which are done in the midst of them." Also in the same place: "Go and smite, and do not spare your eyes. Have no pity on the old man, and the youth, and the virgin, and slay little children and women, that they may be utterly destroyed. …

Treatise XII Three Books of Testimonies Against the Jews ↗

Augustine of Hippo

As you know, all of you who know the holy Scriptures, among the disciples whom the Lord chose while present in the flesh, Peter was the first to be chosen. Paul … was not chosen among them nor with them, but a long time afterward, though not for all that unequal to them. …

Sermon 299.2 ↗

Bede

I am the Alpha and the Omega, etc. In Alpha, he designates the divinity of the Word, and in Omega, the assumed humanity. The beginning without end, which is confirmed by frequent repetition in this book, either to often imply the divinity and humanity of the one Christ, or to signify the entire Trinity of one nature, which says through the prophet: Before me there was no God formed, neither shall there be after me (Isa. XLIII).

Commentary on Revelation ↗

Bonaventure

But because from itself, therefore it lacks a producer and creator: therefore it can neither depend nor begin; and through this it has the highest and most perfect necessity, which excludes all mutability and dependence, inevitability and indigence, coercion and violence, which denote a diminished necessity: and conversely it posits the highest permanence and stability, the highest sufficiency and freedom. …

Quaestiones Disputatae, De Mysterio Trinitatis, Question 7 ↗