The Difference of Aeviternity and Time
Objection 1: It seems that aeviternity is the same as time. For
Augustine says (Gen. ad lit. viii, 20, 22, 23), that "God moves the
spiritual through time." But aeviternity is said to be the measure of
spiritual substances. Therefore time is the same as aeviternity.
Obj. 2: Further, it is essential to time to have "before" and
"after"; but it is essential to eternity to be simultaneously whole,
as was shown above in the first article. Now aeviternity is not
eternity; for it is written (Ecclus. 1:1) that eternal "Wisdom is
before age." Therefore it is not simultaneously whole but has "before"
and "after"; and thus it is the same as time.
Obj. 3: Further, if there is no "before" and "after" in
aeviternity, it follows that in aeviternal things there is no
difference between being, having been, or going to be. Since then it
is impossible for aeviternal things not to have been, it follows that
it is impossible for them not to be in the future; which is false,
since God can reduce them to nothing.
Obj. 4: Further, since the duration of aeviternal things is
infinite as to subsequent duration, if aeviternity is simultaneously
whole, it follows that some creature is actually infinite; which is
impossible. Therefore aeviternity does not differ from time.
_On the contrary,_ Boethius says (De Consol. iii) "Who commandest time
to be separate from aeviternity."
_I answer that,_ Aeviternity differs from time, and from eternity, as
the mean between them both. This difference is explained by some to
consist in the fact that eternity has neither beginning nor end,
aeviternity, a beginning but no end, and time both beginning and end.
This difference, however, is but an accidental one, as was shown
above, in the preceding article; because even if aeviternal things had
always been, and would always be, as some think, and even if they
might sometimes fail to be, which is possible to God to allow; even
granted this, aeviternity would still be distinguished from eternity,
and from time.
Others assign the difference between these three to consist in the
fact that eternity has no "before" and "after"; but that time has
both, together with innovation and veteration; and that aeviternity
has "before" and "after" without innovation and veteration. This
theory, however, involves a contradiction; which manifestly appears
if innovation and veteration be referred to the measure itself. For
since "before" and "after" of duration cannot exist together, if
aeviternity has "before" and "after," it must follow that with the
receding of the first part of aeviternity, the after part of
aeviternity must newly appear; and thus innovation would occur in
aeviternity itself, as it does in time. And if they be referred to
the things measured, even then an incongruity would follow. For a
thing which exists in time grows old with time, because it has a
changeable existence, and from the changeableness of a thing
measured, there follows "before" and "after" in the measure, as is
clear from _Physic._ iv. Therefore the fact that an aeviternal thing
is neither inveterate, nor subject to innovation, comes from its
changelessness; and consequently its measure does not contain
"before" and "after." We say then that since eternity is the measure
of a permanent being, in so far as anything recedes from permanence
of being, it recedes from eternity. Now some things recede from
permanence of being, so that their being is subject to change, or
consists in change; and these things are measured by time, as are all
movements, and also the being of all things corruptible. But others
recede less from permanence of being, forasmuch as their being
neither consists in change, nor is the subject of change;
nevertheless they have change annexed to them either actually or
potentially. This appears in the heavenly bodies, the substantial
being of which is unchangeable; and yet with unchangeable being they
have changeableness of place. The same applies to the angels, who
have an unchangeable being as regards their nature with
changeableness as regards choice; moreover they have changeableness
of intelligence, of affections and of places in their own degree.
Therefore these are measured by aeviternity which is a mean between
eternity and time. But the being that is measured by eternity is not
changeable, nor is it annexed to change. In this way time has
"before" and "after"; aeviternity in itself has no "before" and
"after," which can, however, be annexed to it; while eternity has
neither "before" nor "after," nor is it compatible with such at all.
Reply Obj. 1: Spiritual creatures as regards successive affections
and intelligences are measured by time. Hence also Augustine says
(Gen. ad lit. viii, 20, 22, 23) that to be moved through time, is
to be moved by affections. But as regards their nature they are
measured by aeviternity; whereas as regards the vision of glory, they
have a share of eternity.
Reply Obj. 2: Aeviternity is simultaneously whole; yet it is not
eternity, because "before" and "after" are compatible with it.
Reply Obj. 3: In the very being of an angel considered absolutely,
there is no difference of past and future, but only as regards
accidental change. Now to say that an angel was, or is, or will be,
is to be taken in a different sense according to the acceptation of
our intellect, which apprehends the angelic existence by comparison
with different parts of time. But when we say that an angel is, or
was, we suppose something, which being supposed, its opposite is not
subject to the divine power. Whereas when we say he will be, we do
not as yet suppose anything. Hence, since the existence and
non-existence of an angel considered absolutely is subject to the
divine power, God can make the existence of an angel not future; but
He cannot cause him not to be while he is, or not to have been, after
he has been.
Reply Obj. 4: The duration of aeviternity is infinite, forasmuch as
it is not finished by time. Hence, there is no incongruity in saying
that a creature is infinite, inasmuch as it is not ended by any other
creature.
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SIXTH ARTICLE [I. Q. 10, Art. 6]
Whether There Is Only One Aeviternity?
Objection 1: It seems that there is not only one aeviternity; for it
is written in the apocryphal books of Esdras: "Majesty and power of
ages are with Thee, O Lord."
Obj. 2: Further, different genera have different measures. But
some aeviternal things belong to the corporeal genus, as the heavenly
bodies; and others are spiritual substances, as are the angels.
Therefore there is not only one aeviternity.
Obj. 3: Further, since aeviternity is a term of duration, where
there is one aeviternity, there is also one duration. But not all
aeviternal things have one duration, for some begin to exist after
others; as appears in the case especially of human souls. Therefore
there is not only one aeviternity.
Obj. 4: Further, things not dependent on each other do not seem
to have one measure of duration; for there appears to be one time for
all temporal things; since the first movement, measured by time, is in
some way the cause of all movement. But aeviternal things do not
depend on each other, for one angel is not the cause of another angel.
Therefore there is not only one aeviternity.
_On the contrary,_ Aeviternity is a more simple thing than time, and is
nearer to eternity. But time is one only. Therefore much more is
aeviternity one only.
_I answer that,_ A twofold opinion exists on this subject. Some say
there is only one aeviternity; others that there are many
aeviternities. Which of these is true, may be considered from the
cause why time is one; for we can rise from corporeal things to the
knowledge of spiritual things.
Now some say that there is only one time for temporal things,
forasmuch as one number exists for all things numbered; as time is a
number, according to the Philosopher (Physic. iv). This, however,
is not a sufficient reason; because time is not a number abstracted
from the thing numbered, but existing in the thing numbered;
otherwise it would not be continuous; for ten ells of cloth are
continuous not by reason of the number, but by reason of the thing
numbered. Now number as it exists in the thing numbered, is not the
same for all; but it is different for different things. Hence, others
assert that the unity of eternity as the principle of all duration is
the cause of the unity of time. Thus all durations are one in that
view, in the light of their principle, but are many in the light of
the diversity of things receiving duration from the influx of the
first principle. On the other hand others assign primary matter as
the cause why time is one; as it is the first subject of movement,
the measure of which is time. Neither of these reasons, however, is
sufficient; forasmuch as things which are one in principle, or in
subject, especially if distant, are not one absolutely, but
accidentally. Therefore the true reason why time is one, is to be
found in the oneness of the first movement by which, since it is most
simple, all other movements are measured. Therefore time is referred
to that movement, not only as a measure is to the thing measured, but
also as accident is to subject; and thus receives unity from it.
Whereas to other movements it is compared only as the measure is to
the thing measured. Hence it is not multiplied by their multitude,
because by one separate measure many things can be measured.
This being established, we must observe that a twofold opinion existed
concerning spiritual substances. Some said that all proceeded from God
in a certain equality, as Origen said (Peri Archon. i); or at least
many of them, as some others thought. Others said that all spiritual
substances proceeded from God in a certain degree and order; and
Dionysius (Coel. Hier. x) seems to have thought so, when he said that
among spiritual substances there are the first, the middle and the
last; even in one order of angels. Now according to the first opinion,
it must be said that there are many aeviternities as there are many
aeviternal things of first degree. But according to the second
opinion, it would be necessary to say that there is one aeviternity
only; because since each thing is measured by the most simple element
of its genus, it must be that the existence of all aeviternal things
should be measured by the existence of the first aeviternal thing,
which is all the more simple the nearer it is to the first. Wherefore
because the second opinion is truer, as will be shown later
(Q. 47, A. 2); we concede at present that there is only one
aeviternity.
Reply Obj. 1: Aeviternity is sometimes taken for age, that is, a
space of a thing's duration; and thus we say many aeviternities when
we mean ages.
Reply Obj. 2: Although the heavenly bodies and spiritual things
differ in the genus of their nature, still they agree in having a
changeless being, and are thus measured by aeviternity.
Reply Obj. 3: All temporal things did not begin together;
nevertheless there is one time for all of them, by reason of the
first measured by time; and thus all aeviternal things have one
aeviternity by reason of the first, though all did not begin together.
Reply Obj. 4: For things to be measured by one, it is not necessary
that the one should be the cause of all, but that it be more simple
than the rest.
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QUESTION 11
THE UNITY OF GOD
(In Four Articles)
After the foregoing, we consider the divine unity; concerning which
there are four points of inquiry:
(1) Whether "one" adds anything to "being"?
(2) Whether "one" and "many" are opposed to each other?
(3) Whether God is one?
(4) Whether He is in the highest degree one?
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