Augustine of Hippo
Catena Aurea · Matthäusevangelium 5
For I say unto you, That except your righteousness shall exceed the righteousness of the Scribes and Pharisees, ye shall in no case enter into the kingdom of heaven. Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment: But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
(De Civ. Dei, xx. 9.) Otherwise, unless your righteousness exceed the righteousness of the Scribes and Pharisees, that is, exceed that of those who break what themselves teach, as it is elsewhere said of them, They say, and do not; (Mat. 23:3.) just as if He had said, Unless your righteousness exceed in this way that ye do what ye teach, you shall not enter the kingdom of heaven. We must therefore understand something other than usual by the kingdom of heaven here, in which are to be both he who breaks what he teaches, and he who does it, but the one least, the other great; this kingdom of heaven is the present Church. In another sense is the kingdom of heaven spoken of that place where none enters but he who does what he teaches, and this is the Church as it shall be hereafter.