Jesus Himself compared the Church to a fishing net in which good and bad fish are ultimately separated by God Himself. There is also the parable of the Church as a field on which the good grain that God Himself has sown grows, but also the weeds that “an enemy” secretly sown onto it. Indeed, the weeds in God’s field, the Church, are excessively visible, and the evil fish in the net also show their strength. Nevertheless, the field is still God’s field and the net is God’s fishing net. And at all times, there are not only the weeds and the evil fish, but also the crops of God and the good fish. To proclaim both with emphasis is not a false form of apologetics, but a necessary service to the Truth.
— Pope Benedict XVI