[Footnote 39: Besides Irenaeus I. 10. 1, 2, cf. 9. 1-5; 22. 1; II. 1. 1; 9. 1; 28. 1; 32. 3, 4; III. 1-4; 11. 1; 12. 9; 15. 1; 16. 5 sq.; 18. 3; 24. 1; IV. 1. 2; 9. 2; 20. 6; 33. 7 sq.; V. Praef. 12. 5; 20. 1.] [Footnote 40: See Iren. I. 31. 3; II. Praef. 19. 8.] [Footnote 41: This expression is not found in Irenaeus, but is very common in Tertullian.] [Footnote 42: See de praescr. 13: "Haec regula a Christo instituta nullas habet apud nos quaestiones."] [Footnote 43: See I. c. 14: "Ceterum manente forma regulae in suo ordine quantumlibet quaeras et tractes." See de virg. vol. 1.] [Footnote 44: See 1. c. 14: "Fides in regula posita est, habet legem et salutem de observatione legis," and de vir. vol. 1.] [Footnote 45: See de praescr. 21: "Si haec ita sunt, constat perinde omnem doctrinam, quae cum illis ecclesiis apostolicis matricibus et originalibus fidei conspiret, veritati deputandum ... Superest ergo ut demonstremus an haec nostra doctrina, cujus regulam supra edidimus, de apostolorum traditione censeatur ... Communicamus cum ecclesiis catholicis, quod nulla doctrina diversa." De praescr. 32: "Ecclesiae, quae licet nullum ex apostolis auctorem suum proferant, ut multo posteriores, tamen in eadem fide conspirantes non minus apostolicae deputantur pro consanguinitate doctrinae." That Tertullian regards the baptismal confession as identical with the _regula fidei_, just as Irenaeus does, is shown by the fact that in de spectac. 4 ("Cum aquam ingressi Christianam fidem in legis suae verba profitemur, renuntiasse nos diabolo et pompae et angelis eius ore nostro contestamur.") the baptismal confession is the _lex_. He also calls it "sacramentum" (military oath) in ad mart. 3; de idolol. 6; de corona 11; Scorp. 4. But he likewise gives the same designation to the interpreted baptismal confession (de praescr. 20, 32; adv. Marc. IV. 5); for we must regard the passages cited as referring to this. Adv. Marc. I. 21: "regula sacramenti;" likewise V. 20, a passage specially instructive as to the fact that there can be only one regula. The baptismal confession itself had a fixed and short form (see de spectac. 4; de corona, 3: "amplius aliquid respondentes quam dominus in evangelio determinavit;" de bapt. 2: "homo in aqua demissus et inter pauca verba tinctus;" de bapt. 6, 11; de orat. 2 etc.). We can still prove that, apart from a subsequent alteration, it was the Roman confession that was used in Carthage in the days of Tertullian. In de praescr. 26 Tertullian admits that the Apostles may have spoken some things "inter domesticos," but declares that they could not be communications "quae aliam regulam fidei superducerent."]