The emphasis on this part of the verse is the result of judgement. In this case, the state of the wicked who "weep, and wail, and gnash their teeth." Why do the wicked suffer this punishment? It is because "they would not hearken unto the voice of the Lord; therefore the Lord redeemeth them not." In the context of Abinadi's argument, this conclusion is inevitable. Those who are not redeemed are those who choose not to listen to the gospel of the atoning Messiah. Those who are not redeemed, who shall weep, and wail, and gnash their teeth, are the priests of Noah who have denied this atoning Messiah.