Catholic Treasury Network

The Twelve Tracts

Catholic dogmatic theology divides naturally into twelve major tracts. Each one is presented here with Pohle-Preuss as the systematic spine, Glenn's Tour of the Summa as the bridge to Aquinas, and the major encyclicals and conciliar documents in context.

Tract I
God: His Existence & Attributes
Pohle Vol. I · Summa I, QQ. 2–26

God's existence and attributes — the proofs from reason, divine simplicity, perfection, and unity.

19 Pohle 26 Tour 7 docs
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Tract II
The Blessed Trinity
Pohle Vol. II · Summa I, QQ. 27–43

One God in three Persons — processions, relations, and missions.

17 Pohle 17 Tour
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Tract III
Creation & the Supernatural Order
Pohle Vol. III · Summa I, QQ. 44–119

God as Creator; the angels; man's body and soul; original justice and original sin.

11 Pohle 76 Tour 2 docs
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Tract IV
Christology
Pohle Vol. IV · Summa III, QQ. 1–26

The Person of Christ — the Incarnation, hypostatic union, two natures.

10 Pohle 25 Tour 3 docs
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Tract V
Soteriology
Pohle Vol. V · Summa III, QQ. 46–52

The work of Christ — redemption, satisfaction, merit.

11 Pohle 29 Tour
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Tract VI
Mariology
Pohle Vol. VI

Divine motherhood, perpetual virginity, Immaculate Conception, Assumption.

12 Pohle 4 Tour 3 docs
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Tract VII
Grace
Pohle Vol. VII · Summa I-II, QQ. 109–114

Actual grace, sanctifying grace, justification, and merit — the supernatural life of the soul.

25 Pohle 1 W&S 14 Tour 2 docs
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Tract VIII
The Sacraments
Pohle Vols. VIII–XI · Summa III, QQ. 60–90

The seven sacraments — visible signs of invisible grace.

60 Pohle 99 Tour 4 docs
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Tract IX
Moral Theology
Summa I-II & II-II

Conscience, law, sin, the virtues and vices, the Decalogue.

277 Tour 5 docs
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Tract X
Ecclesiology
Wilhelm-Scannell Vol. 2

The Church — her nature, marks, authority, infallibility, and the papal primacy.

7 Tour 6 docs
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Tract XI
Eschatology
Pohle Vol. XII · Summa Suppl., QQ. 69–99

Death, judgement, heaven, hell, purgatory, the resurrection of the body.

8 Pohle 32 Tour 2 docs
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Tract XII
Spiritual Theology
Tanquerey

The purgative, illuminative, and unitive ways; prayer; perfection.

4 Tour 1 doc
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