Summa Theologica Quotes by Thomas Aquinas (2025)

“The human mind may perceive truth only through thinking, as is clear from Augustine.”
Thomas Aquinas, Summa Theologica

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“Nothing which implies contradiction falls under the omnipotence of God.”
St. Thomas Aquinas, Summa Theologica

tags: contradiction, god, omnipotence, power, reason

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“God Himself is the rule and mode of virtue. Our faith is measured by divine truth, our hope by the greatness of His power and faithful affection, our charity by His goodness. His truth, power and goodness outreach any measure of reason. We can certainly never believe, trust or love God more than, or even as much as, we should. Extravagance is impossible. Here is no virtuous moderation, no measurable mean; the more extreme our activity, the better we are.”
St. Thomas Aquinas, Summa Theologica

tags: faith, god, hope, love

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“Thus the sun which possesses light perfectly, can shine by itself; whereas the moon which has the nature of light imperfectly, sheds only a borrowed light.”
Thomas Aquinas, Summa Theologica

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“to make peace either in oneself or among others, shows a man to be a follower of God,”
Thomas Aquinas, Summa Theologica

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“I answer that, As Augustine says (De Moribus Eccl. vi), "the soul needs to follow something in order to give birth to virtue: this something is God: if we follow Him we shall live aright.”
Thomas Aquinas, The Summa Theologica: Complete Edition

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“The truth can be perceived only through thinking, as is proven by Augustine.”
Thomas Aquinas, Summa Theologica

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“In the old law, God was praised both with musical instruments, and human voices. But the church does not use musical instruments to praise God, lest she should seem to judaize.”
St. Thomas Aquinas, Summa Theologica

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“The science of mathematics treats its object as though it were something abstracted mentally, whereas it is not abstract in reality.”
Saint Thomas Aquinas, The Summa Theologica: Complete Edition

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“The Philosopher, too, says of the wicked (Ethic. ix, 4) that "their soul is divided against itself . . . one part pulls this way, another that"; and afterwards he concludes, saying: "If wickedness makes a man so miserable, he should strain every nerve to avoid vice.”
Thomas Aquinas, The Summa Theologica: Complete Edition

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“If our opponent believes nothing of divine revelation, there is no longer any means of proving the articles of faith by reasoning, but only of answering his objections--if he has any--against faith. Since faith rests upon infallible truth, and since the contrary of a truth can never be demonstrated, it is clear that the arguments brought against faith cannot be demonstrations, but are difficulties that can be answered.”
Thomas Aquinas, Summa Theologica

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“nothing can be known, save what is true;”
Thomas Aquinas, Summa Theologica

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“Honor is due to God and to persons of great excellence as a sign of attestation of excellence already existing; not that honor makes them excellent.”
Thomas Aquinas, Summa Theologica

tags: fame, popularity, reputation

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“I answer that, It was necessary for man's salvation that there should be a knowledge revealed by God besides philosophical science built up by human reason. Firstly, indeed, because man is directed to God, as to an end that surpasses the grasp of his reason: "The eye hath not seen, O God, besides Thee, what things Thou hast prepared for them that wait for Thee" (Is. 66: 4). But the end must first be known by men who are to direct their thoughts and actions to the end. Hence it was necessary for the salvation of man that certain truths which exceed human reason should be made known to him by divine revelation. Even as regards those truths about God which human reason could have discovered, it was necessary that man should be taught by a divine revelation; because the truth about God such as reason could discover, would only be known by a few, and”
Thomas Aquinas, Summa Theologica

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“Jerome says (Ep. ad Nepot. lii): "Shun, as you would the plague, a cleric who from being poor has become wealthy, or who, from being a nobody has become a celebrity.”
Thomas Aquinas, Summa Theologica

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“For it is essential to opinion that we assent to one of two opposite assertions with fear of the other, so that our adhesion is not firm: to science it is essential to have firm adhesion with intellectual vision, for science possesses certitude which results from the understanding of principles: while faith holds a middle place, for it surpasses opinion in so far as its adhesion is firm, but falls short of science in so far as it lacks vision.”
Thomas Aquinas, The Summa Theologica: Complete Edition

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“Further, nothing, except sin, is contrary to an act of virtue. But war is contrary to peace. Therefore war is always a sin.”
Saint Thomas Aquinas, Summa Theologica

tags: book-ii, chapter-40

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“the intention of every man acting according to virtue is to follow the rule of reason, wherefore the intention of all the virtues is directed to the same end, so that all the virtues are connected together in the right reason of things to be done, viz. prudence,”
Thomas Aquinas, The Summa Theologica: Complete Edition

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“Pipes are not to be used for teaching, nor any artificial instruments, as the harp, or the like: but whatsoever will make the hearers good men.”
St. Thomas Aquinas, Summa Theologica

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“God is not, like creatures, made up of parts. God is spirit, without bodily dimensions. Firstly, no body can cause change without itself being changed. Secondly, things with dimensions are potential of division. But the starting-point for all existence must be wholly real and not potential in any way: though things that get realized begin as potential, preceding them is the source of their realization which must already be real. Thirdly, living bodies are superior to other bodies; and what makes a body living is not the dimensions which make it a body (for then everything with dimensions would be living), but something more excellent like a soul. The most excellent existent of all then cannot be a body. So when the scriptures ascribe dimensions to God they are using spatial extension to symbolize the extent of God's power; just as they ascribe bodily organs to God as metaphors for their functions, and postures like sitting or standing to symbolize authority or strength.”
Thomas Aquinas, Summa Theologiae: A Concise Translation

tags: god, philosophy, semantics, theology

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“Hence it is written (Wis. 9:14): "The thoughts of mortal men are fearful, and our counsels uncertain." Thus man needs to be guarded by the angels. Reply”
Thomas Aquinas, Summa Theologica

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“Now in matters of action the reason directs all things in view of the end:”
Thomas Aquinas, The Summa Theologica: Complete Edition

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“Sciences are differentiated according to the various means through which knowledge is obtained. For the astronomer and the physicist both may prove the same conclusion: that the earth, for instance, is round: the astronomer by means of mathematics (i.e. abstracting from matter), but the physicist by means of matter itself. Hence there is no reason why those things which may be learned from philosophical science, so far as they can be known by natural reason, may not also be taught us by another science so far as they fall within revelation. Hence theology included in sacred doctrine differs in kind from that theology which is part of philosophy. SECOND ARTICLE [I, Q.”
Thomas Aquinas, Summa Theologica

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“The emotion of love is an affective emotion, directly reacting to goodness, rather than an aggressive one, reacting to challenge. Not only our so-called natural ability to grow and propagate exemplify natural love, but every faculty has a built-in affinity for what accords with its nature. By passion we mean some result of being acted on: either a form induced by the agent (like weight) or a movement consequent on the form (like falling to the ground). Whatever we desire acts on us in this way, first arousing an emotional attachment to itself and making itself agreeable, and then drawing us to seek it. The first change the object produces in our appetite is a feeling of its agreeableness: we call this love (weight can be thought of as a sort of natural love); then desire moves us to seek the object and pleasure comes to rest in it. Clearly then, as a change induced in us by an agent, love is a passion: the affective emotion strictly so, the will to love by stretching of the term. Love unites by making what is loved as agreeable to the lover as if it were himself or a part of himself. Though love is not itself a movement of the appetite towards an object, it is a change the appetite undergoes rendering an object agreeable. Favour is a freely chosen and willing love, open only to reasoning creatures; and charity―literally, holding dear―is a perfect form of love in which what is loved is highly prized. To love, as Aristotle says, is to want someone’s good; so its object is twofold: the good we want, loved with a love of desire, and the someone we want it for (ourselves or someone else), loved with a love of friendship. And just as what exist in the primary sense are subjects of existence, and properties exist only in a secondary sense, as modes in which subjects exist; so too what we love in the primary sense is the someone whose good we will, and only in a secondary sense do we love the good so willed. Friendship based on convenience or pleasure is friendship inasmuch as we want our friend’s good; but because this is subordinated to our own profit or pleasure such friendship is subordinated to love of desire and falls short of true friendship.”
Thomas Aquinas, Summa Theologiae: A Concise Translation

tags: love, philosophy, theology

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“A capacity as such is directed to an act. Wherefore we seek to know the nature of a capacity from the act to which it is directed, and consequently the nature of a capacity is diversified as the nature of the act is diversified.”
Thomas Aquinas, Summa Theologiae

tags: act, capacities

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“I answer that, Every being, as being, is good. For all being, as being, has actuality and is in some way perfect; since every act implies some sort of perfection; and perfection implies desirability and goodness, as is clear from A[1]. Hence it follows that every being as such is good.”
Thomas Aquinas, Summa Theologica

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“Now the maximum in any genus is the cause of all in that genus; as fire, which is the maximum heat, is the cause of all hot things. Therefore there must also be something which is to all beings the cause of their being, goodness, and every other perfection; and this we call God.”
Thomas Aquinas, Summa Theologica

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“yet so that envy is not to be taken for a passion, but for a will resisting the good of another.”
Thomas Aquinas, Summa Theologica

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“Objection 3: Further, it is written (1 Cor. 13:12): "We see now through a glass in a dark manner; but then face to face.”
Thomas Aquinas, Summa Theologica

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“Hence Augustine says (Gen. ad lit. ii, 8): "The other things which are lower than the angels are so created that they first receive existence in the knowledge of the rational creature, and then in their own nature.”
Thomas Aquinas, Summa Theologica

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Summa Theologica Quotes by Thomas Aquinas (2025)

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