Thomas Aquinas - Summa Theologica, Part I-II (Pars Prima Secundae)

Again this is made clear by reason. For the intellect needs not the body, for its operation, save on account of the phantasms, wherein it looks on the intelligible truth, as stated in the First Part (Q. 84, A. 7). Now it is evident that the Divine Essence cannot be seen by means of phantasms, as stated in the First Part (Q. 12, A. 3). Wherefore, since man's perfect Happiness consists in the vision of the Divine Essence, it does not depend on the body. Consequently, without the body the soul can be happy.

We must, however, notice that something may belong to a thing's perfection in two ways. First, as constituting the essence thereof; thus the soul is necessary for man's perfection. Secondly, as necessary for its well-being: thus, beauty of body and keenness of perfection belong to man's perfection. Wherefore though the body does not belong in the first way to the perfection of human Happiness, yet it does in the second way. For since operation depends on a thing's nature, the more perfect is the soul in its nature, the more perfectly it has its proper operation, wherein its happiness consists. Hence, Augustine, after inquiring (Gen. ad lit. xii, 35) "whether that perfect Happiness can be ascribed to the souls of the dead separated from their bodies," answers "that they cannot see the Unchangeable Substance, as the blessed angels see It; either for some other more hidden reason, or because they have a natural desire to rule the body."

Reply Obj. 1: Happiness is the perfection of the soul on the part of the intellect, in respect of which the soul transcends the organs of the body; but not according as the soul is the natural form of the body. Wherefore the soul retains that natural perfection in respect of which happiness is due to it, though it does not retain that natural perfection in respect of which it is the form of the body.

Reply Obj. 2: The relation of the soul to being is not the same as that of other parts: for the being of the whole is not that of any individual part: wherefore, either the part ceases altogether to be, when the whole is destroyed, just as the parts of an animal, when the animal is destroyed; or, if they remain, they have another actual being, just as a part of a line has another being from that of the whole line. But the human soul retains the being of the composite after the destruction of the body: and this because the being of the form is the same as that of its matter, and this is the being of the composite. Now the soul subsists in its own being, as stated in the First Part (Q. 75, A. 2). It follows, therefore, that after being separated from the body it has perfect being and that consequently it can have a perfect operation; although it has not the perfect specific nature.

Reply Obj. 3: Happiness belongs to man in respect of his intellect: and, therefore, since the intellect remains, it can have Happiness. Thus the teeth of an Ethiopian, in respect of which he is said to be white, can retain their whiteness, even after extraction.

Reply Obj. 4: One thing is hindered by another in two ways. First, by way of opposition; thus cold hinders the action of heat: and such a hindrance to operation is repugnant to Happiness. Secondly, by way of some kind of defect, because, to wit, that which is hindered has not all that is necessary to make it perfect in every way: and such a hindrance to operation is not incompatible with Happiness, but prevents it from being perfect in every way. And thus it is that separation from the body is said to hold the soul back from tending with all its might to the vision of the Divine Essence. For the soul desires to enjoy God in such a way that the enjoyment also may overflow into the body, as far as possible. And therefore, as long as it enjoys God, without the fellowship of the body, its appetite is at rest in that which it has, in such a way, that it would still wish the body to attain to its share.

Reply Obj. 5: The desire of the separated soul is entirely at rest, as regards the thing desired; since, to wit, it has that which suffices its appetite. But it is not wholly at rest, as regards the desirer, since it does not possess that good in every way that it would wish to possess it. Consequently, after the body has been resumed, Happiness increases not in intensity, but in extent.

Reply Obj. 6: The statement made (Gen. ad lit. xii, 35) to the effect that "the souls of the departed see not God as the angels do," is not to be understood as referring to inequality of quantity; because even now some souls of the Blessed are raised to the higher orders of the angels, thus seeing God more clearly than the lower angels. But it refers to inequality of proportion: because the angels, even the lowest, have every perfection of Happiness that they ever will have, whereas the separated souls of the saints have not. ________________________

SIXTH ARTICLE [I-II, Q. 4, Art. 6]

Whether Perfection of the Body Is Necessary for Happiness?

Objection 1: It would seem that perfection of the body is not necessary for man's perfect Happiness. For perfection of the body is a bodily good. But it has been shown above (Q. 2) that Happiness does not consist in bodily goods. Therefore no perfect disposition of the body is necessary for man's Happiness.

Obj. 2: Further, man's Happiness consists in the vision of the Divine Essence, as shown above (Q. 3, A. 8). But the body has no part in this operation, as shown above (A. 5). Therefore no disposition of the body is necessary for Happiness.

Obj. 3: Further, the more the intellect is abstracted from the body, the more perfectly it understands. But Happiness consists in the most perfect operation of the intellect. Therefore the soul should be abstracted from the body in every way. Therefore, in no way is a disposition of the body necessary for Happiness.

On the contrary, Happiness is the reward of virtue; wherefore it is written (John 13:17): "You shall be blessed, if you do them." But the reward promised to the saints is not only that they shall see and enjoy God, but also that their bodies shall be well-disposed; for it is written (Isa. 66:14): "You shall see and your heart shall rejoice, and your bones shall flourish like a herb." Therefore good disposition of the body is necessary for Happiness.

I answer that, If we speak of that happiness which man can acquire in this life, it is evident that a well-disposed body is of necessity required for it. For this happiness consists, according to the Philosopher (Ethic. i, 13) in "an operation according to perfect virtue"; and it is clear that man can be hindered, by indisposition of the body, from every operation of virtue.

But speaking of perfect Happiness, some have maintained that no disposition of body is necessary for Happiness; indeed, that it is necessary for the soul to be entirely separated from the body. Hence Augustine (De Civ. Dei xxii, 26) quotes the words of Porphyry who said that "for the soul to be happy, it must be severed from everything corporeal." But this is unreasonable. For since it is natural to the soul to be united to the body; it is not possible for the perfection of the soul to exclude its natural perfection.

Consequently, we must say that perfect disposition of the body is necessary, both antecedently and consequently, for that Happiness which is in all ways perfect. Antecedently, because, as Augustine says (Gen. ad lit. xii, 35), "if the body be such, that the governance thereof is difficult and burdensome, like unto flesh which is corruptible and weighs upon the soul, the mind is turned away from that vision of the highest heaven." Whence he concludes that, "when this body will no longer be 'natural,' but 'spiritual,' then will it be equalled to the angels, and that will be its glory, which erstwhile was its burden." Consequently, because from the Happiness of the soul there will be an overflow on to the body, so that this too will obtain its perfection. Hence Augustine says (Ep. ad Dioscor.) that "God gave the soul such a powerful nature that from its exceeding fulness of happiness the vigor of incorruption overflows into the lower nature."