Give not that which is holy unto the dogs, neither cast your pearls before swine, lest they trample them under their feet, and turn again and tear you.
All Commentaries on Matthew 7:6 Go To Matthew 7
George Leo Haydock
AD 1849
Give not that which is holy, or holy things, (as in the Greek) to dogs; i.e. to scandalous libertines, or infidels, who are not worthy to partake of divine mysteries and sacraments, who sacrilegiously abuse them, and trample them under their feet, as hogs do pearls. (Witham)
The sacred mysteries should not be given to those that are not properly instructed in the sublime nature of them; nor should we hold any communication of religion with those that are enemies to the truths of Christ, which they tread under their feet and treat contemptuously, and will be so far from having any more friendship for you on account of such a criminal complaisance, that it is more probable they will betray you and turn against you. (Haydock)