Jesus' disciples had a responsibility to pass their knowledge of the kingdom on to others so they, too, could prepare for it. Jesus gave them directions about this responsibility in this verse. This exhortation balances the one He just gave (vv. 1-5). The disciples could be too naive and fail to be discerning (cf. 5:43-47).
Pigs were unclean, wild, vicious animals. Likewise most dogs were not domestic pets but unclean, wild, despised creatures. This verse contains a chiastic construction. The dogs turn and tear to pieces those who give them special gifts, and the pigs trample under foot the pearls thrown before them. What is holy and the pearls in this illustration evidently represent the good news announcing the kingdom. The pigs and dogs probably do not represent all Gentiles but people of any race who react to the good news by rejecting and turning against those who bring it to them (cf. 10:14; 15:14).345
