Augustine of Hippo
Matthew recounts that at a certain moment, the disciples approached Jesus and inquired, “Who is the greatest in the kingdom of heaven?” In response, Jesus brought a child into their midst and said, “Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.” While Mark includes a similar account, he does not capture all that Matthew has, and he includes elements absent from Matthew's narrative. From our understanding, it seems Peter's inquiry about the frequency of forgiving a brother has been omitted from their dialogue; yet, the Lord's reply clearly links this exchange with the ongoing conversation.
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In contrast, Luke focuses solely on the child Jesus presented as an example for the disciples when they consider their own significance, introducing fragments that echo parts of the dialogue but situated elsewhere and under different contexts. Likewise, after the resurrection, John records the Lord's teachings on forgiving sinners, noting that sins would remain upon them unless they were forgiven by the disciples, while Matthew presents the same teachings within this current discussion, earlier directing them toward Peter. We should not hesitate to acknowledge that the Lord may have reiterated similar teachings in various contexts, as has been emphasized previously. When encountering these teachings in an inconsistent arrangement, we must remember this principle, eliminating the need for endless explanations regarding the same concepts.