Quotes from book
Summa Theologica

Thomas Aquinas Original title Summa Theologiae (Latin)

The Summa Theologiae is the best-known work of Thomas Aquinas . Although unfinished, the Summa is "one of the classics of the history of philosophy and one of the most influential works of Western literature." It is intended as an instructional guide for theology students, including seminarians and the literate laity. It is a compendium of all of the main theological teachings of the Catholic Church. It presents the reasoning for almost all points of Christian theology in the West. The Summa's topics follow a cycle: God; Creation, Man; Man's purpose; Christ; the Sacraments; and back to God.

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“Whether God can make the past not to have been?
Objection 1: It seems that God can make the past not to have been. For what is impossible in itself is much more impossible than that which is only impossible accidentally. But God can do what is impossible in itself, as to give sight to the blind, or to raise the dead. Therefore, and much more can He do what is only impossible accidentally. Now for the past not to have been is impossible accidentally: thus for Socrates not to be running is accidentally impossible, from the fact that his running is a thing of the past. Therefore God can make the past not to have been.
Objection 2: Further, what God could do, He can do now, since His power is not lessened. But God could have effected, before Socrates ran, that he should not run. Therefore, when he has run, God could effect that he did not run.
Objection 3: Further, charity is a more excellent virtue than virginity. But God can supply charity that is lost; therefore also lost virginity. Therefore He can so effect that what was corrupt should not have been corrupt. On the contrary, Jerome says (Ep. 22 ad Eustoch.): "Although God can do all things, He cannot make a thing that is corrupt not to have been corrupted." Therefore, for the same reason, He cannot effect that anything else which is past should not have been.
I answer that, As was said above (Q[7], A[2]), there does not fall under the scope of God's omnipotence anything that implies a contradiction. Now that the past should not have been implies a contradiction. For as it implies a contradiction to say that Socrates is sitting, and is not sitting, so does it to say that he sat, and did not sit. But to say that he did sit is to say that it happened in the past. To say that he did not sit, is to say that it did not happen. Whence, that the past should not have been, does not come under the scope of divine power. This is what Augustine means when he says (Contra Faust. xxix, 5): "Whosoever says, If God is almighty, let Him make what is done as if it were not done, does not see that this is to say: If God is almighty let Him effect that what is true, by the very fact that it is true, be false": and the Philosopher says (Ethic. vi, 2): "Of this one thing alone is God deprived---namely, to make undone the things that have been done."
Reply to Objection 1: Although it is impossible accidentally for the past not to have been, if one considers the past thing itself, as, for instance, the running of Socrates; nevertheless, if the past thing is considered as past, that it should not have been is impossible, not only in itself, but absolutely since it implies a contradiction. Thus, it is more impossible than the raising of the dead; in which there is nothing contradictory, because this is reckoned impossible in reference to some power, that is to say, some natural power; for such impossible things do come beneath the scope of divine power.
Reply to Objection 2: As God, in accordance with the perfection of the divine power, can do all things, and yet some things are not subject to His power, because they fall short of being possible; so, also, if we regard the immutability of the divine power, whatever God could do, He can do now. Some things, however, at one time were in the nature of possibility, whilst they were yet to be done, which now fall short of the nature of possibility, when they have been done. So is God said not to be able to do them, because they themselves cannot be done.
Reply to Objection 3: God can remove all corruption of the mind and body from a woman who has fallen; but the fact that she had been corrupt cannot be removed from her; as also is it impossible that the fact of having sinned or having lost charity thereby can be removed from the sinner.”

Thomas Aquinas book Summa Theologica

Summa Theologica Question 25 Article 6 http://www.ccel.org/ccel/aquinas/summa.FP_Q25_A4.html
Summa Theologica (1265–1274), Unplaced by chapter

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“Whatever is in motion must be put in motion by another. If that by which it is put in motion be itself put in motion, then this also must needs be put in motion by another, and that by another again. But this cannot go on to infinity, because then there would be no first mover, and, consequently, no other mover; seeing that subsequent movers move only inasmuch as they are put in motion by the first mover; as the staff moves only because it is put in motion by the hand. Therefore it is necessary to arrive at a first mover, put in motion by no other; and this everyone understands to be God.”

Thomas Aquinas book Summa Theologica

I, q. 2, art. 3
Summa Theologica (1265–1274)

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“The fire of hell is called eternal, only because it never ends. Still, there is change in the pains of the lost…Hence in hell true eternity does not exist, but rather time.”

Thomas Aquinas book Summa Theologica

I, q. 10, art. 3, ad 2
Summa Theologica (1265–1274)

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“God is the most noble of beings. Now it is impossible for a body to be the most noble of beings; for a body must be either animate or inanimate; and an animate body is manifestly nobler than any inanimate body. But an animate body is not animate precisely as body; otherwise all bodies would be animate. Therefore its animation depends upon some other thing, as our body depends for its animation on the soul. Hence that by which a body becomes animated must be nobler than the body. Therefore it is impossible that God should be a body.”

Thomas Aquinas book Summa Theologica

I, q. 3
Summa Theologica (1265–1274)

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“Not everyone who is enlightened by an angel knows that he is enlightened by him.”

Thomas Aquinas book Summa Theologica

I, q. 111, art. 1, ad 3
Summa Theologica (1265–1274)

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“Concerning perfect blessedness which consists in a vision of God.”

Thomas Aquinas book Summa Theologica

Summa Theologica (1265–1274), Unplaced by chapter

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“It was necessary for our salvation that there be a knowledge revealed by God, besides philosophical science built up by human reason. Firstly, indeed, because the human being 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" (Isaiah 64:4). 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.”

Thomas Aquinas book Summa Theologica

Part I, Question 1, Article 1; tr. Fathers of the English Dominican Province (1920, New York: Benziger Bros.)
Summa Theologica (1265–1274)

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“The image of God always abides in the soul, whether this image be obsolete and clouded over as to amount to almost nothing; or whether it be obscured or disfigured, as is the case with sinners; or whether it be clear and beautiful as is the case with the just.”

Thomas Aquinas book Summa Theologica

I, q. 93, art. 8, ad 3
Summa Theologica (1265–1274)

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“God alone can satisfy the will of a human being.”

Thomas Aquinas book Summa Theologica

I–II, q. 2, art. 8
Summa Theologica (1265–1274)
Context: Now the object of the will, i. e., of man's appetite, is the universal good... Hence it is evident that nothing can lull the human will but the universal good. This is to be found, not in any creature, but in God alone; because every creature has goodness by participation. Thus God alone can satisfy the will of a human being.

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“For although the will cannot be inwardly moved by any creature, yet it can be moved inwardly by God.”

Thomas Aquinas book Summa Theologica

III, q. 18, art. 1, ad 1
Summa Theologica (1265–1274)
Context: Whatever was in the human nature of Christ was moved at the bidding of the divine will; yet it does not follow that in Christ there was no movement of the will proper to human nature, for the good wills of other saints are moved by God's will... For although the will cannot be inwardly moved by any creature, yet it can be moved inwardly by God.

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“Therefore they will wish all the good were damned.”

Thomas Aquinas book Summa Theologica

Supplement, Q98, Article 4
Note: This Supplement to the Third Part was compiled after Aquinas's death by Regnald of Piperno, out of material from Aquinas's much earlier "Commentary on the Sentences".
Summa Theologica (1265–1274)
Context: Even as in the blessed in heaven there will be most perfect charity, so in the damned there will be the most perfect hate. Wherefore as the saints will rejoice in all goods, so will the damned grieve for all goods. Consequently the sight of the happiness of the saints will give them very great pain; hence it is written (Isaiah 26:11): "Let the envious people see and be confounded, and let fire devour Thy enemies." Therefore they will wish all the good were damned.

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“Even as in the blessed in heaven there will be most perfect charity, so in the damned there will be the most perfect hate.”

Thomas Aquinas book Summa Theologica

Supplement, Q98, Article 4
Note: This Supplement to the Third Part was compiled after Aquinas's death by Regnald of Piperno, out of material from Aquinas's much earlier "Commentary on the Sentences".
Summa Theologica (1265–1274)
Context: Even as in the blessed in heaven there will be most perfect charity, so in the damned there will be the most perfect hate. Wherefore as the saints will rejoice in all goods, so will the damned grieve for all goods. Consequently the sight of the happiness of the saints will give them very great pain; hence it is written (Isaiah 26:11): "Let the envious people see and be confounded, and let fire devour Thy enemies." Therefore they will wish all the good were damned.

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“Grace does not destroy nature but perfects it.”

Thomas Aquinas book Summa Theologica

I, q. 1, art. 8, ad 2
Summa Theologica (1265–1274)

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“If forgers and other malefactors are forthwith condemned to death by the secular authorities, there is much more reason for heretics, as soon as they are convicted of heresy, to be not only excommunicated but even put to death.”

Thomas Aquinas book Summa Theologica

Source: Summa Theologica (1265–1274) II–II, q. 11, art. 3 co

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“Perfect happiness can consist in nothing else than the vision of the Divine Essence.”

Thomas Aquinas book Summa Theologica

Source: Summa Theologica (1265–1274), I–II, q. 3, art. 8 co

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“There does not fall under the scope of God's omnipotence anything that implies a contradiction. Now that the past should not have been implies a contradiction.... Whence, that the past should not have been, does not come under the scope of divine power.”

Thomas Aquinas book Summa Theologica

Source: Summa Theologica (1265–1274), I, q. 25, art. 4