Whether man can attain happiness?
Objection 1: It would seem that man cannot attain happiness. For just as the rational is above the sensible nature, so the intellectual is above the rational, as Dionysius declares (Div. Nom. iv, vi, vii) in several passages. But irrational animals that have the sensitive nature only, cannot attain the end of the rational nature. Therefore neither can man, who is of rational nature, attain the end of the intellectual nature, which is Happiness.
Objection 2: Further, True Happiness consists in seeing God, Who is pure Truth. But from his very nature, man considers truth in material things: wherefore "he understands the intelligible species in the phantasm" (De Anima iii, 7). Therefore he cannot attain Happiness.
Objection 3: Further, Happiness consists in attaining the Sovereign Good. But we cannot arrive at the top without surmounting the middle. Since, therefore, the angelic nature through which man cannot mount is midway between God and human nature; it seems that he cannot attain Happiness.
On the contrary, It is written (Ps. 93:12): "Blessed is the man whom Thou shalt instruct, O Lord."
I answer that, Happiness is the attainment of the Perfect Good. Whoever, therefore, is capable of the Perfect Good can attain Happiness. Now, that man is capable of the Perfect Good, is proved both because his intellect can apprehend the universal and perfect good, and because his will can desire it. And therefore man can attain Happiness. This can be proved again from the fact that man is capable of seeing God, as stated in FP, Q 12, A 1: in which vision, as we stated above (Q 3, A 8) man's perfect Happiness consists.
Reply to Objection 1: The rational exceeds the sensitive nature, otherwise than the intellectual surpasses the rational. For the rational exceeds the sensitive nature in respect of the object of its knowledge: since the senses have no knowledge whatever of the universal, whereas the reason has knowledge thereof. But the intellectual surpasses the rational nature, as to the mode of knowing the same intelligible truth: for the intellectual nature grasps forthwith the truth which the rational nature reaches by the inquiry of reason, as was made clear in the FP, Q 58, A 3; FP, Q 79, A 8. Therefore reason arrives by a kind of movement at that which the intellect grasps. Consequently the rational nature can attain Happiness, which is the perfection of the intellectual nature: but otherwise than the angels. Because the angels attained it forthwith after the beginning of their creation: whereas man attains if after a time. But the sensitive nature can nowise attain this end.
Reply to Objection 2: To man in the present state of life the natural way of knowing intelligible truth is by means of phantasms. But after this state of life, he has another natural way, as was stated in the FP, Q 84, A 7 ; FP, Q 89, A 1.
Reply to Objection 3: Man cannot surmount the angels in the degree of nature so as to be above them naturally. But he can surmount them by an operation of the intellect, by understanding that there is above the angels something that makes men happy; and when he has attained it, he will be perfectly happy.
I–II · Q. 5, Art. 2: Whether one man can be happier than another?
Whether one man can be happier than another?
Objection 1: It would seem that one man cannot be happier than another. For Happiness is "the reward of virtue," as the Philosopher says (Ethic. i, 9). But equal reward is given for all the works of virtue; because it is written (Mat. 20:10) that all who labor in the vineyard "received every man a penny"; for, as Gregory says (Hom. xix in Evang.), "each was equally rewarded with eternal life." Therefore one man cannot be happier than another.
Objection 2: Further, Happiness is the supreme good. But nothing can surpass the supreme. Therefore one man's Happiness cannot be surpassed by another's.
Objection 3: Further, since Happiness is "the perfect and sufficient good" (Ethic. i, 7) it brings rest to man's desire. But his desire is not at rest, if he yet lacks some good that can be got. And if he lack nothing that he can get, there can be no still greater good. Therefore either man is not happy; or, if he be happy, no other Happiness can be greater.
On the contrary, It is written (Jn. 14:2): "In My Father's house there are many mansions"; which, according to Augustine (Tract. lxvii in Joan.) signify "the diverse dignities of merits in the one eternal life." But the dignity of eternal life which is given according to merit, is Happiness itself. Therefore there are diverse degrees of Happiness, and Happiness is not equally in all.
I answer that, As stated above (Q 1, A 8; Q 2, A 7), Happiness implies two things, to wit, the last end itself, i.e. the Sovereign Good; and the attainment or enjoyment of that same Good. As to that Good itself, Which is the object and cause of Happiness, one Happiness cannot be greater than another, since there is but one Sovereign Good, namely, God, by enjoying Whom, men are made happy. But as to the attainment or enjoyment of this Good, one man can be happier than another; because the more a man enjoys this Good the happier he is. Now, that one man enjoys God more than another, happens through his being better disposed or ordered to the enjoyment of Him. And in this sense one man can be happier than another.
Reply to Objection 1: The one penny signifies that Happiness is one in its object. But the many mansions signify the manifold Happiness in the divers degrees of enjoyment.
Reply to Objection 2: Happiness is said to be the supreme good, inasmuch as it is the perfect possession or enjoyment of the Supreme Good.
Reply to Objection 3: None of the Blessed lacks any desirable good; since they have the Infinite Good Itself, Which is "the good of all good," as Augustine says (Enarr. in Ps. 134). But one is said to be happier than another, by reason of diverse participation of the same good. And the addition of other goods does not increase Happiness, since Augustine says (Confess. v, 4): "He who knows Thee, and others besides, is not the happier for knowing them, but is happy for knowing Thee alone."