Just as a good tree cannot produce evil fruit, so neither can truth generate heresy; and as a corrupt tree cannot yield good fruit, so heresy will not produce truth. Thus, Marcion brought nothing good out of Cerdon's evil treasure; nor Apelles out of Marcion's.
Those who are under the bishop will not be able to support and vindicate him: for they will say to him what is written in the Gospel, "Why beholdest thou the mote that is in thy brother's eye, but considerest not the beam that is in thine own eye? "
