Reasoning steps: Baptism: effect

Verdicts: S3 · Baptism: effect. Shared notes and post-750 development: baptism.

S03.1 (was baptism/B1): Does baptism regenerate / remit sins?

Step S03.1.1: Scripture

John 3:5 (ἐξ ὕδατος καὶ πνεύματος); Acts 2:38 (εἰς ἄφεσιν τῶν ἁμαρτιῶν); Acts 22:16 (ἀπόλουσαι τὰς ἁμαρτίας σου); Titus 3:5 (διὰ λουτροῦ παλιγγενεσίας); Rom 6:3–4; Col 2:11–12; 1 Pet 3:21 (βάπτισμα … σῴζει). Read in context, the plain sense of these texts ties forgiveness and new birth to the washing. A purely symbolic reading needs a sign-versus-thing distinction that these texts do not themselves draw. Faith is assumed throughout (Mark 16:16; Col 2:12 “through faith”).

Step S03.1.2: Patristic evidence

justin-martyr-bap-s1 (“regenerated”), tertullian-bap-s1, cyprian-bap-s1, augustine-bap-s1, augustine-bap-s3; John of Damascus IV.9 (from the justification notes).

Step S03.1.3: Weighing decision

Reading A: baptism is the ordinary means of regeneration and remission. Reading B: it is a sign of a regeneration already received by faith. A is chosen. Every witness verified, from Justin (c. 155) to John of Damascus, says it, and none says B. The objection that A makes faith unnecessary does not hold: Justin’s candidates have already believed and repented. B first appears as a developed position in the 16th century (Zwingli, Anabaptists) (dating to verify).

• Confidence: High

Step S03.1.4: Source-proximity weighing

See the proximity tiers.

• Scripture (benchmark): John 3:5; Acts 2:38; 22:16; Titus 3:5; Rom 6:3–4; 1 Pet 3:21: the plain sense ties regeneration and remission to the washing, with faith assumed. (Scripture confidence: high)
• Key sources by tier: Justin Martyr (T2, w 0.8); Tertullian (T2, w 0.8); Augustine (T3, w 0.6). Proximity factor: 0.733 (mean tier weight of 3 key source(s)).
• Assessment: Supported in Scripture and in T2 (Justin; Tertullian). Here the early and biblical witness agree with each other against the Presbyterian loosening. Verdict unchanged.

S03.2 (was baptism/B4): Necessity

Step S03.2.1: Scripture

John 3:5; Mark 16:16 (the negative clause concerns unbelief, not lack of baptism); Luke 23:43 (the penitent thief).

Step S03.2.2: Patristic evidence

cyril-of-jerusalem-bap-s1 (necessary, except martyrs), augustine-bap-s1 (apostolic tradition), augustine-bap-s2 (unbaptized infants: “mildest condemnation”), justin-martyr-bap-s1.

Step S03.2.3: Weighing decision

Reading A: absolutely necessary. Reading B: ordinarily necessary, with exceptions (martyrdom; desire or the thief, later developed). Reading C: not necessary. B is chosen. Cyril already names the martyr exception. Augustine’s harsh conclusion about infants follows from his teaching on original sin (see the original-sin category, forthcoming) and is not the consensus wording of the East. C has no patristic support.

• Confidence: High (B); the fate of unbaptized infants is low consensus.

Step S03.2.4: Source-proximity weighing

See the proximity tiers.

• Scripture (benchmark): John 3:5 is the ordinary rule; Mark 16:16 condemns unbelief, not lack of baptism; the thief (Luke 23:43). (Scripture confidence: medium)
• Key sources by tier: Cyril of Jerusalem (T3, w 0.6); Augustine (T3, w 0.6). Proximity factor: 0.6 (mean tier weight of 2 key source(s)).
• Assessment: Ordinary necessity has T2 and Scripture support. The damnation of unbaptized infants (Augustine, T3) lacks early and biblical support. Verdict unchanged.