It ought to be observed, therefore, what is signified by ‘holy’ and what is signified by ‘pearl.’ Augustine says: “Holy things are kept inviolate and immaculate; and precious pearls ought not to be despised.” By ‘dogs,’ which tear with their teeth, heretics are signified; by ‘swine,’ which trample with their feet, the unclean are signified. Therefore, to give holy things to dogs is to administer holy things to heretics. Likewise, if something spiritual is consecrated, and this is despised, it is given to swine. Or, by ‘holy things,’ the ecclesiastical sacraments are signified; by ‘pearls,’ the mysteries of truth are signified. A dog is an entirely unclean animal; a pig is partly unclean, and partly not unclean. By ‘dogs,’ the infidels are signified; by ‘swine,’ the bad faithful are signified. Therefore, Give not that which is holy to dogs, that is, do not give the sacraments to infidels. The ‘pearls,’ that is, the spiritual interpretations, ought not to be given to swine; “The sensual man perceiveth not these things that are of the Spirit of God” (I Cor. 2, 14), that is, lest they despise them; “A soul that is full shall tread upon the honeycomb” (Prov. 27, 7). Hence, turning, to sins, they tear, because they despise, or they raise objections. But why? Did not Christ say many things to the infidels, and they were trampling upon His words? I say that He did this for the sake of the good men who were with the bad men, who thereafter were profiting.