Catena Fidei

1 Corinthians 15:8 (WEB)
and last of all, as to the child born at the wrong time, he appeared to me also.

Catechism · 3

§642Paragraph 2 · On the Third Day He Rose from the DeadRead at vatican.va
“Peter and the Twelve are the primary "witnesses to his Resurrection", but they are not the only ones - Paul speaks clearly of more than five hundred persons to whom Jesus appeared on a single occasion and also of James and of all the apostles.” — Catechism footnote: I Cor 15:4-8; cf. Acts 1:22.

§659Article 6 · "He Ascended into Heaven and is Seated at the Right Hand of the Father"Read at vatican.va
“Only in a wholly exceptional and unique way would Jesus show himself to Paul "as to one untimely born", in a last apparition that established him as an apostle.” — Catechism footnote: 1 Cor 15:8; cf. 9:1; Gal 1:16.

§857Paragraph 3 · The Church is One, Holy, Catholic, and ApostolicRead at vatican.va
“The Church is apostolic because she is founded on the apostles, in three ways: - she was and remains built on "the foundation of the Apostles," The witnesses chosen and sent on mission by Christ himself;” — Catechism footnote: Cf. Mt 28:16-20; Acts 1:8; 1 Cor 9:1; 15:7-8; Gal 1:1; etc.

Origen, Against Celsus II.62Book II
“And last of all He was seen of me also, as of one born out of due time.”” — editor's note: 1 Cor. xv. 3–8.
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Irenaeus of Lyons, Against Heresies I.8Book I
“And that the Saviour appeared to her when she lay outside of the Pleroma as a kind of abortion, they affirm Paul to have declared in his Epistle to the Corinthians [in these words], “And last of all, He appeared to me also, as to one born out of due time.”” — editor's note: 1 Cor. xv. 8.
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Tertullian, Against Praxeas Chapter 15
“…Son Himself—mortality, accessibility—of whom the apostle testifies that “He died according to the Scriptures,” and that “He was seen by himself last of all,”—by means, of course, of the light which was accessible, although it was not without imperilling his sight that he experienced that light.” — editor's note: Ver. 8.
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Cyril of Jerusalem, Catechetical Lectures Lecture 15
“But thou sayest that His brother James was a partial witness; afterwards He was seen also of me Paul, His enemy; and what testimony is doubted, when an enemy proclaims it?” — editor's note: 1 Cor. xv. 8.
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Eusebius of Caesarea, Church History II.1Book II
“In addition to these, Paul, that “chosen vessel,” “not of men neither through men, but by the revelation of Jesus Christ himself and of God the Father who raised him from the dead,” was appointed an apostle, being made worthy of the call by a vision and by a voice which was uttered in a revelation from heaven.” — editor's note: See Acts ix. 3 sqq.; xxii. 6 sqq.; xxvi. 12 sqq.; Gal. i. 16; 1 Cor. xv. 8–10
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Augustine of Hippo, Harmony of the Gospels III.26Book III
“And last of all He was seen of me also, as of one born out of due time.”” — editor's note: 1 Cor. xv. 3–8.
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Augustine of Hippo, Tractates on the Gospel of John Tractate 95
“Once more, in reference to this righteousness, are we to say that the Apostle Paul was not righteous when confessing that He had seen Christ after His ascension into heaven, which was undoubtedly the time of which He had already said, “Ye shall see me no more”?” — editor's note: 1 Cor. xv. 8.
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Jerome, Letters Letter 47
“Following the example of Tranquillus and of Apollonius the Greek, I have written a book concerning illustrious men from the apostles’ time to our own; and after enumerating a great number I have put myself down on the last page as one born out of due time, and the least of all Christians.” — editor's note: Cf. 1 Cor. xv. 8, 9.
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