John Chrysostom (attributed)

The righteousness of the Scribes and Pharisees are the commandments of Moses; but the commandments of Christ are the fulfilment of that Law. This then is His meaning; Whosoever in addition to the commandments of the Law shall not fulfil My commandments, shall not enter into the kingdom of heaven. For those indeed save from the punishment due to transgressors of the Law, but do not bring into the kingdom; but My commandments both deliver from punishment, and bring into the kingdom. But seeing that to break the least commandments and not to keep them are one and the same, why does He say above of him that breaks the commandments, that he shall be the least in the kingdom of heaven, and here of him who keeps them not, that he shall not enter into the kingdom of heaven? See how to be the least in the kingdom is the same with not entering into the kingdom. For a man to be in the kingdom is not to reign with Christ, but only to be numbered among Christ’s people; what He says then of him that breaks the commandments is, that he shall indeed be reckoned among Christians, yet the least of them. But he who enters into the kingdom, becomes partaker of His kingdom with Christ. Therefore he who does not enter into the kingdom of heaven, shall not indeed have a part of Christ’s glory, yet shall he be in the kingdom of heaven, that is, in the number of those over whom Christ reigns as King of heaven.