The New Testament is the most popular collection. However, there are also non-canonical writings attributed to Paul as well as to other Christians.
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There are numerous gospels, epistles and books of instruction, such as the Didache, that were not included in the New Testament. Some were certainly considered, while others were seen as too different in theology to be accepted.
If it's in the New Testament then it was part of the teaching of the early Christians since the New Testament authors were the early Christians. It is possible that the reference is to the absence of this from any recorded preaching or from any of Paul's doctrinal letters. A simple explanation exists for this. Such was not in dispute and so there was no need to discuss it. Many other accepted Christian doctrines were not discussed at times or only in passing as they were believed and so not needing to be elaborated on.
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Augustine
70% Roman Catholic15% Evangelical Christian Denominations15% Other Beliefs