The primary object of contemplation is, in fact, God Himself and His infinite perfections, especially
His goodness, His wisdom, and His providence.
What is eternity?
10. The Eternity Of God
Having discussed the divine immensity in its relation to space, we must now consider God’s eternity in relation to time. Without it we can have no conception of Providence, whose decrees are eternal.
Let us examine the wrong notion people sometimes have of this divine eternity, and then we shall better understand the true definition of it, which is likewise a very beautiful.
What is eternity?
There is a partially erroneous conception of the divine eternity current among those who are content to define it as a duration without beginning and without end, thinking of it vaguely as time without limit either in the past or in the future.
Such a notion of eternity is inadequate: because a time that had no beginning, no first day, would always be, nevertheless, a succession of days and years and centuries, a succession embracing a past, a present, and a future. That is not eternity at all. We might go back in the past and number the centuries without ever coming to an end, just as in thinking of the time to come we picture to
ourselves the future acts of immortal souls as an endless series. Even if time had no beginning, there would still have been a succession of varying moments.
The present instant, which constitutes the reality of time, is an instant fleeting between the past and the future ("nunc fluens, " says St. Thomas), an instant fleeting like the waters of a river, or like the apparent movement of the sun by which we count the days and the hours. What, then, is time? As Aristotle says, it is the measure of motion, more especially of the sun’s motion, or rather that of
the earth around the sun, the rotation of the earth on its axis constituting one day as its revolution around the sun constitutes one year. If the earth and the sun had been created by God from all eternity and the regular motion of the earth around the sun had been without beginning, there would not have been a first day or a first year, but there would always have been a succession of years and centuries. Such a succession would then have been a duration without either beginning or end, but a duration, nevertheless, infinitely inferior to eternity; for there would always have been the distinction between past, present, and future. In other words, multiply the centuries by thousands and thousands, and it will always be time; however long drawn out, it will never be eternity.
If, then, to define the divine eternity as a duration without either beginning or end is inadequate, what is it? The answer of theology is that it is a duration without either beginning or end, but with this very distinctive characteristic, that in it there is no succession either past or future, but an everlasting present. It is not a fleeting instant, like the passing of time, but an immobile instant which never
passes, an unchanging instant. It is "the now that stands, not that flows away, " 67 says St. Thomas (Ia, q. 10, a. 2, obj. Ia), like a perpetual morning that had no dawn and will know no evening.
How are we to conceive this unique instant of an unchanging eternity? Whereas time, this succession of days and years, is the measure of the apparent motion of the sun or the real motion of the earth, eternity is the measure or duration of the being, thought, and love of God. Now these are absolutely immutable, without either change or variation or vicissitude. Since God is of necessity the infinite
fullness of being, there is nothing for Him to gain or to lose. God can never increase or diminish in perfection; He is perfection itself unchangeable.
This absolute fixity of the divine being necessarily extends to His wisdom and His will; any change or progress in the divine knowledge and love would argue imperfection.
The unchangeableness, however, is not the unchangeableness of inertia or death; it is that of supreme life, possessing once and for all everything it is possible and right that it should possess, neither having to acquire it nor being able to lose it.
Thus we come to the true definition of eternity: an exceedingly profound and beautiful definition, one full of spiritual instruction for us.
