The reading which Marcion had in xi.

22 is expressly stated to have been common to the Gnostic heretics generally.

In some of these instances the dogmatic motive is gross and palpable, in most it seems to have been made out, but some (such as especially xiii.

1-9) are still doubtful, and the method of excision does not appear to have been carried out with complete consistency.
This, indeed, was only to be expected.

We are constantly reminded that Tertullian, a man, with all his faults, of enormous literary and general power, did not possess the critical faculty, and no more was that faculty likely to be found in Marcion.