How a mortal sin becomes venial and a venial mortal

Erroneous conscience, imperfect advertence, contempt, scandal, danger of grave sin.

The works themselves ask 3 questions under this heading — see them together with their answers.

Also asked about as…

when a mortal sin is only venial (ed.)

In the index as Sin · Consent · Matter of Sin · Circumstance · Contempt · Venial sin · Will · *Habitus peccaminosi* · *Parvitas materiae* · Advertence · Coalescence · Consent of the will · Danger · Formal contempt · Formal sin · Grace · Habits · Imperfect · Mortal sin · Object of the human act · Sins · Tomus II. On the Prima Secundae

In the manuals

Read the manuals side by side → — each work's whole treatment in its own column

A Manual of Moral Theology for English-Speaking Countries

Thomas Slater, S.J.

Vol. I, Bk. IV, Pt. I, Chapter II. The Gravity of Sin, n. 5 — Mortal sin may in certain circumstances become venial, and, on the contrary, venial sin may become following paragraphs will make this clear: mortal. The (a) Mortal sin may become venial on account of an erroneous consci… Read in context →

Moral Theology: A Complete Course (McHugh & Callan)

John A. McHugh, O.P., and Charles J. Callan, O.P. — 16 passages

Vol. I, Pt. I, Q. II, Art. 3. Bad Habits, or Vices, Mortal Sin, nn. 169, 170, 171, 172, 173, 174, 175, 176, 177, 178 & 179 (11 passages — hover a number to read it)

Vol. I, Pt. I, Q. II, Art. 3. Bad Habits, or Vices, Venial Sin, nn. 180, 181, 182, 183 & 184 (5 passages — hover a number to read it)

Compendium of Moral Theology of Fr. John Peter Gury, S.J., with the Notes of Antonio Ballerini, S.J.

Jean-Pierre Gury, S.J.; notes by Antonio Ballerini, S.J. — 7 passages

Vol. I, Treatise On Sins, Part One. On Sins in Gener…, Gravity, and Distinction o…, Ch. II, Especially on Mortal and Venial Sin, nn. 153 & 154 (7 passages — hover a number to read it)

A Handbook of Moral Theology (Koch–Preuss)

Antony Koch; adapted and edited by Arthur Preuss — 3 passages

Vol. II, Pt. I, Ch. I, Section 3: Distinctive Characteristics of Mortal and Venial Sin, nn. ¶9, ¶10 & ¶11 (3 passages — hover a number to read it)

Manuale Theologiae Moralis

Dominic M. Prümmer, O.P.

Vol. I, Pt. I, Tract V. On Sins In General, Ch. II, Article III. On Venial Sin, n. 371 — 371. Change of malice. Although venial sin can never become mortal by multiplication, as was said above in n. 367, nevertheless an action objectively evil venially can become subjectively mortally sinful, and conversely … Read in context →

Summa Theologiae Moralis

Benedict Henry Merkelbach, O.P. — 20 passages

Vol. I, General Moral Theology, Treatise: On Sins in General, Third Part: On the Effects…, Fourth Question: On Mortal…, Article V: On the Conversion of Mortal and Venial Sin, nn. ¶1, 547, 548, 549 & 550 (20 passages — hover a number to read it)

Compendium of Moral Theology

Aloysius Sabetti, S.J., and Timothy Barrett, S.J.

Vol. I, Tr. IV, Pt. I, Chapter II. On the Gravity of Sin, n. 128, Q. 4 — 128. Question 4. In what way does a sin mortal from its genus become venial, and vice versa? Response. A sin mortal from its genus can become venial in a fourfold way, namely by reason of: 1st. smallness of matter; 2nd. … Read in context →

Summa Summae S. Thomae (Billuart)

Charles-René Billuart, O.P. — 41 passages

Billuart, Summa Summae, Tomus II. On the Prima Sec…, On Sins, On Mortal and Venial Sin, Whether venial sin disposes to mortal, and can become mortal, and mortal contrariwise become venial?, nn. 1–41 (41 passages)

Treated under the broader heading Mortal and Venial Sin — Noldin, Summa of Moral Theology · Wouters, Manual of Moral Theology · Bucceroni, Institutions of Moral Theology · Tanquerey · Vermeersch, Theologia Moralis · Marc, Institutiones Morales · Konings, Theologia Moralis · Slater, Cases I · Spirago · Slater, Foundation — these works do not divide the matter as finely as we do here, so their treatment stands one heading up (ed.)