And why behold you the speck that is in your brother's eye, but perceive not the beam that is in your own eye?
All Commentaries on Luke 6:41 Go To Luke 6
Tertullian of Carthage
AD 220
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.