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Ref. Saying 22, 48, 61, 104 in this regard on gaining both Yin and Yang, Mother and Father into wholeness. The fact that Simon Peter is cast in this role perhaps shows of a tension between the Thomist eastern school and the Petrine Syrian school.
Yesu answers with an esoteric truth which not only reiterates the central message of the book but also turns the judgement on the speaker to consider whether he has acquired the unity required for salvation.