Augustine of Hippo

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(ubi sup.) Yet not without reason did the Lord say, Seventy times seven; for the Law is set forth in ten precepts; and the Law is signified by the number ten, sin by eleven, because it is passing the denary line. Seven is used to be put for a whole, because time goes round in seven days. Take eleven seven times, and you have seventy. He would therefore have all trespasses forgiven, for this is what He signifies by the number seventy-seven.