| 401. | Leo XIII Encyclical Mirae Caritatis (May 28, 1902) On the Holy Eucharist | 3 | |
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| 402. | Justin's Hortatory Address to the Greeks VII Inconsistencies of Plato's doctrine | 2 | |
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| 403. | Aquinas Summa Contra Gentiles XIV That to acquire knowledge of God one must use the war of remotion | 6 | |
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| 404. | Leo XIII Encyclical Pastoralis Vigilantiae (June 25, 1891) | 4 | |
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| 405. | Pius X Encyclical Vehementer Nos (February 11, 1906) On the French Law of Separation | 13 | |
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| 406. | Saint Justin Martyr's "On the Sole Government of God" | 2 | |
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| 407. | Leo XIII Encyclical Graves De Communi Re (January 18, 1901) On Christian Democracy | 3 | |
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| 408. | Aquinas Summa Contra Gentiles XLVI That in this life the soul does not understand itself by itself | 2 | |
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| 409. | Justin's Sole Government of God III Testimonies to a future judgment | 2 | |
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| 410. | Justin's Hortatory Address to the Greeks XXXVI True Knowledge not held by the philosophers | 2 | |
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| 411. | Aquinas Summa Contra Gentiles LXVII Against those who say that the possible intellect is imagination | 7 | |
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| 412. | Justin's Sole Government of God IV God desires not sacrifices, but righteousness | 2 | |
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| 413. | Aquinas Summa Contra Gentiles VII That in God there is active power | 3 | |
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| 414. | Aquinas Summa Contra Gentiles XLV It is impossible in this life to understand separate substances | 3 | |
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| 415. | Justin's Hortatory Address to the Greeks XXVII Plato's knowledge of the judgment | 3 | |
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| 416. | Aquinas Summa Contra Gentiles LII No Created Substance Can Naturally See God's Essence | 4 | |
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| 417. | Aquinas Summa Contra Gentiles LIV Composition of substance & being is not the same as matter & form | 1 | |
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| 418. | Justin's Hortatory Address to the Greeks XXXV Appeal to the Greeks | 2 | |
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| 419. | Aquinas Summa Contra Gentiles LXXXII Objection to God wills not of necessity things other then him | 3 | |
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| 420. | Aquinas Summa Contra Gentiles XCIV That the separate substance & the soul are not of one species | 2 | |
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| 421. | Justin's Hortatory Address to the Greeks VI Further disagreements between Plato and Aristotle | 2 | |
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| 422. | Pius X Encyclical Singulari Quadam (September 24, 1912) On Labor Organizations | 5 | |
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| 423. | Aquinas Summa Contra Gentiles LXXX God necessarily wills his being and his goodness | 3 | |
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| 424. | Pius X Syllabus Lamentabili Sane Exitu (July 3, 1907) CONDEMNING THE ERRORS OF THE MODERNISTS | 5 | |
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| 425. | Aquinas Summa Contra Gentiles LXX That God knows trivial things | 4 | |
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| 426. | Aquinas Summa Contra Gentiles LV That intellectual substances are incorruptible | 3 | |
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| 427. | Dialogue of Justin and Trypho CXXXVI - The Jews, in rejecting Christ, rejected God who sent Him | 3 | |
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| 428. | Aquinas Summa Contra Gentiles XIV That evil is an accidental cause | 4 | |
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| 429. | Leo XIII Encyclical Affari Vos (December 8, 1897) On the Manitoba School Question | 3 | |
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| 430. | Aquinas Summa Contra Gentiles IV That evil is unintentional in things | 5 | |
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| 431. | Aquinas Summa Contra Gentiles XXXV The several names spoken of God are not synonymous | 7 | |
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| 432. | Aquinas Summa Contra Gentiles XLVIII That intellectual substances are of free will of acting | 2 | |
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| 433. | Aquinas Summa Contra Gentiles XLVII That in this life we are unable to see God in his essence | 6 | |
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| 434. | Aquinas Summa Contra Gentiles LIII In created intellectual substances, there is act and potency | 3 | |
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| 435. | Aquinas Summa Contra Gentiles LII Continuation of Chapter LI | 3 | |
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| 436. | Aquinas Summa Contra Gentiles LXXVI Active intellect is part of the soul, not a separate substance. | 3 | |
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| 437. | Aquinas Summa Contra Gentiles XXVII God is not the form of a body | 3 | |
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| 438. | Leo XIII Encyclical Fin dal Principio (December 8, 1902) | 3 | |
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| 439. | Aquinas Summa Contra Gentiles XXVIII That happiness does not consist in honors | 3 | |
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| 440. | Aquinas Summa Contra Gentiles XLI God is the supreme good | 4 | |
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| 441. | Athenagoras Legatio Pro Christianis XIX The philosophers agree with the poets respecting the gods | 2 | |
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| 442. | Aquinas Summa Contra Gentiles LXII Against the opinion of Alexander about the possible intellect | 3 | |
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| 443. | Aquinas Summa Contra Gentiles VII Human reason is not in opposition to the truth of Christian faith | 3 | |
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| 444. | Aquinas Summa Contra Gentiles XXVIII & XXIX How there is anything due in the production of things | 7 | |
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| 445. | Aquinas Summa Contra Gentiles V, VI Intentions and Evil: Counterarguments and Responses | 6 | |
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| 446. | Leo XIII Encyclical Litteras a Vobis (July 2, 1894) On the Clergy in Brasil | 2 | |
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| 447. | Leo XIII Encyclical Magni Nobis (March 7, 1889) On the Catholic University of America | 3 | |
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| 448. | Aquinas Summa Contra Gentiles XXXIV Arguments of whom want to prove an eternal world by creation | 2 | |
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| 449. | Athenagoras On the Resurrection of the Dead IX Absurdity of arguing from man's impotency | 2 | |
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| 450. | Aquinas Summa Contra Gentiles XCII How virtues are to be ascribed to God | 2 | |
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| 451. | Pius X Encyclical Gravissimo Officii Munere (August 10, 1906) On French Associations of Worship | 5 | |
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| 452. | Aquinas Summa Contra Gentiles XVIII In God there is no composition | 4 | |
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| 453. | Athenagoras Legatio Pro Christianis XV The Christians distinguish God from matter | 3 | |
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| 454. | Aquinas Summa Contra Gentiles LIV How divine essence mirrors all intelligible things | 4 | |
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| 455. | Athenagoras Legatio Pro Christianis XI Moral teaching of Christians repels the charge against them | 4 | |
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| 456. | Aquinas Summa Contra Gentiles LVIII God does not understand by combining and dividing | 4 | |
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| 457. | Aquinas Summa Contra Gentiles LXII That divine truth is the first and highest truth | 2 | |
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| 458. | Athenagoras Legatio Pro Christianis VIII Absurdities of polytheism | 3 | |
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| 459. | Justin's Other Fragments IV Attributed to Saint Justin Martyr and Others | 4 | |
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| 460. | Leo XIII Encyclical Inimica Vis (December 8, 1892) On Freemasonry | 32 | |
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| 461. | Leo XIII Encyclical In Plurimis (May 5, 1888) On the Abolition of Slavery | 4 | |
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| 462. | Athenagoras Legatio Pro Christianis XXIII Opinions of Thales and Plato | 2 | |
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| 463. | Leo XIII Encyclical Permoti Nos (July 10, 1895) On Social Conditions in Belgium | 1 | |
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| 464. | Athenagoras Legatio Pro Christianis V Testimony of the poets to the unity of God | 3 | |
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| 465. | Justin's Extant Fragments on the Resurrection V The resurrection of the flesh is not impossible | 2 | |
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| 466. | Justin's Hortatory Address to the Greeks VIII Antiquity, inspiration, & harmony of Catholic teachers | 2 | |
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| 467. | Justin's Hortatory Address to the Greeks XXXII Plato's doctrine of the heavenly gift | 2 | |
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| 468. | Athenagoras Legatio Pro Christianis IV The Christians are not atheists, but acknowledge one only God | 3 | |
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| 469. | Aquinas Summa Contra Gentiles XXXI God's perfect nature & many names don't contradict His simplicity | 4 | |
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| 470. | Justin's Other Fragments I Tatian & St. Irenaeus | 2 | |
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| 471. | Justin's Extant Fragments on the Resurrection III If members rise, must they discharge the same? | 2 | |
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| 472. | Justin's Hortatory Address to the Greeks II The poets are unfit to be religious teachers | 3 | |
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| 473. | Justin's Hortatory Address to the Greeks XXIII Plato's self contradiction | 4 | |
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| 474. | Leo XIII Encyclical Auspicato Concessum (September 17, 1882) On St. Francis of Assisi | 5 | |
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| 475. | Aquinas Summa Contra Gentiles VIII In what relation human reason stands to the truth of faith | 2 | |
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| 476. | Justin's Hortatory Address to the Greeks XXXVII Of the Sibyl | 4 | |
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| 477. | Justin's Hortatory Address to the Greeks XXX Homer's knowledge of man's origin | 4 | |
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| 478. | Aquinas Summa Contra Gentiles XXVI Whether happiness consists in an act of the will | 10 | |
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| 479. | Leo XIII Encyclical Supremi Apostolatus Officio (September 1, 1883) On Devotion to the Rosary | 4 | |
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| 480. | Aquinas Summa Contra Gentiles IV The philosopher & the theologian treat creatures in different ways | 2 | |
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| 481. | Athenagoras Legatio Pro Christianis XXXV The Christians condemn and detest all cruelty | 2 | |
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| 482. | Justin's Hortatory Address to the Greeks XII Antiquity of Moses proved | 4 | |
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| 483. | Justin's Hortatory Address to the Greeks XXV Plato's knowledge of God's eternity | 3 | |
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| 484. | Aquinas Summa Contra Gentiles LXIV That the soul is not a harmony | 3 | |
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| 485. | Aquinas Summa Contra Gentiles XCVI That separate substances don't gather knowledge form sensibles | 4 | |
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| 486. | Aquinas Summa Contra Gentiles XCIV That the contemplative virtues are in God | 2 | |
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| 487. | Athenagoras Legatio Pro Christianis XXXIII Chastity of the Christians with respect to marriage | 2 | |
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| 488. | Aquinas Summa Contra Gentiles XXIV How even things devoid of knowledge seek the good | 4 | |
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| 489. | Leo XIII Encyclical Arcanum (February 10, 1880) On Christian Marriage | 4 | |
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| 490. | Aquinas Summa Contra Gentiles VIII That God's power is his substance | 3 | |
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| 491. | Pius X Encyclical Communium Rerum (April 21, 1909) On St. Anselm of Aosta | 4 | |
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| 492. | Aquinas Summa Contra Gentiles LXXV God, in willing himself, also wills other things | 4 | |
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| 493. | Athenagoras Legatio Pro Christianis XX Absurd representations of the gods | 4 | |
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| 494. | Leo XIII Encyclical Divinum Illud Munus (May 9, 1897) On the Holy Spirit Divinum | 3 | |
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| 495. | Aquinas Summa Contra Gentiles XXXIX That the distinction of things is not from chance | 3 | |
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| 496. | Aquinas Summa Contra Gentiles LXXVI God wills himself and other things by one act of his will | 8 | |
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| 497. | Aquinas Summa Contra Gentiles LXXIX God wills even the things that are not yet | 2 | |
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| 498. | Aquinas Summa Contra Gentiles XLIX God knows things other than himself | 1 | |
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| 499. | Justin's Sole Government of God II Testimonies to the unity of God | 3 | |
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| 500. | Leo XIII Encyclical Fidentem Piumque Animum (September 20, 1896) On the Rosary | 5 | |
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