The Gospel of Thomas — a collection of sayings attributed to Jesus — was almost certainly known to some early Christian communities but was never accepted as authoritative by mainstream Christianity. The early church restricted its canonical gospels to four — Matthew, Mark, Luke, and John — and Irenaeus explicitly affirmed this tetrad while rejecting alternative texts as lacking apostolic warrant. The criterion for canonical inclusion was apostolic origin, widespread liturgical use, and doctrinal conformity; the Gospel of Thomas, lacking verifiable apostolic transmission and carrying Gnostic associations (secret wisdom, esoteric sayings detached from narrative), failed all three. Eusebius systematically cataloged accepted, disputed, and rejected writings — works associated with fringe sects and absent from orthodox liturgy fell firmly into the rejected category.
Irenaeus affirmed the fourfold gospel as the only canonical witnesses to Christ's life and teaching, assigning mystic significance to the number four and explicitly rejecting any excess or deficiency — marginalizing non-apostolic alternatives like the Gospel of Thomas as lacking the verifiable apostolic tradition on which canonical status depends.
Eusebius categorized New Testament writings by canonical status: accepted books were universally acknowledged across the churches; disputed or pseudepigraphical works associated with heretical figures were rejected on grounds of non-apostolic authenticity and doctrinal variance — the criteria that placed the Gospel of Thomas firmly outside the canon.
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