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 (John 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 Obj. 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 Obj. 2: Happiness is said to be the supreme good, inasmuch as
it is the perfect possession or enjoyment of the Supreme Good.

Reply Obj. 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."
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THIRD ARTICLE [I-II, Q. 5, Art. 3]

Whether One Can Be Happy in This Life?

Objection 1: It would seem that Happiness can be had in this life. For
it is written (Ps. 118:1): "Blessed are the undefiled in the way, who
walk in the law of the Lord." But this happens in this life. Therefore
one can be happy in this life.

Obj. 2: Further, imperfect participation in the Sovereign Good does