Dallin H. Oaks
"The shepherd has a responsibility to protect the flock against all of these threats. That responsibility may require him to deny a predator the fellowship of the Saints or even to sever his membership in the flock. As Jesus taught: 'If he repent not he shall not be numbered among my people, that he may not destroy my people, for behold I know my sheep, and they are numbered.'" (The Lord's Way, p. 227)