from
charity cannot be filled. For the more we rejoice in God, the more is
our joy in Him filled. But we can never rejoice in Him as much as it
is meet that we should rejoice in God, since His goodness which is
infinite, surpasses the creature's joy which is finite. Therefore joy
in God can never be filled.

Obj. 2: Further, that which is filled cannot be increased. But the
joy, even of the blessed, can be increased, since one's joy is
greater than another's. Therefore joy in God cannot be filled in a
creature.

Obj. 3: Further, comprehension seems to be nothing else than the
fulness of knowledge. Now, just as the cognitive power of a creature
is finite, so is its appetitive power. Since therefore God cannot be
comprehended by any creature, it seems that no creature's joy in God
can be filled.

_On the contrary,_ Our Lord said to His disciples (John 15:11): "That
My joy may be in you, and your joy may be filled."

_I answer that,_ Fulness of joy can be understood in two ways; first,
on the part of the thing rejoiced in, so that one rejoice in it as
much as it is meet that one should rejoice in it, and thus God's joy
alone in Himself is filled, because it is infinite; and this is
condignly due to the infinite goodness of God: but the joy of any
creature must needs be finite. Secondly, fulness of joy may be
understood on the part of the one who rejoices. Now joy is compared
to desire, as rest to movement, as stated above (I-II, Q. 25, AA. 1,
2), when we were treating of the passions: and rest is full when
there is no more movement. Hence joy is full, when there remains
nothing to be desired. But as long as we are in this world, the
movement of desire does not cease in us, because it still remains
possible for us to approach nearer to God by grace, as was shown
above (Q. 24, AA. 4, 7). When once, however, perfect happiness has
been attained, nothing will remain to be desired, because then there
will be full enjoyment of God, wherein man will obtain whatever he
had desired, even with regard to other goods, according to Ps. 102:5:
"Who satisfieth thy desire with good things." Hence desire will be at
rest, not only our desire for God, but all our desires: so that the
joy of the blessed is full to perfection--indeed over-full, since
they will obtain more than they were capable of desiring: for
"neither hath it entered into the heart of man, what things God hath
prepared for them that love Him" (1 Cor. 2:9). This is what