On the nature of things (books 4 - 6)   

With ministering heat new light amain;
Are all alive to quiver with their fires,-
Are so alive, that thus the light ne'er leaves
The spots it shines on, as if rent in twain:
So speedily is its destruction veiled
By the swift birth of flame from all the fires.
Thus, then, we must suppose that sun and moon
And stars dart forth their light from under-births
Ever and ever new, and whatso flames
First rise do perish always one by one-
Lest, haply, thou shouldst think they each endure
Inviolable.
Again, perceivest not
How stones are also conquered by Time?-
Not how the lofty towers ruin down,
And boulders crumble?- Not how shrines of gods
And idols crack outworn?- Nor how indeed
The holy Influence hath yet no power
There to postpone the Terminals of Fate,
Or headway make 'gainst Nature's fixed decrees?
Again, behold we not the monuments
Of heroes, now in ruins, asking us,
In their turn likewise, if we don't believe
They also age with eld? Behold we not
The rended basalt ruining amain
Down from the lofty mountains, powerless
To dure and dree the mighty forces there
Of finite time?- for they would never fall
Rended asudden, if from infinite Past
They had prevailed against all engin'ries
Of the assaulting aeons, with no crash.
Again, now look at This, which round, above,
Contains the whole earth in its one embrace:
If from itself it procreates all things-
As some men tell- and takes them to itself
When once destroyed, entirely must it be
Of mortal birth and body; for whate'er
From out itself giveth to other things
Increase and food, the same perforce must be
Minished, and then recruited when it takes
Things back into itself.
Besides all this,
If there had been no origin-in-birth
Of lands and sky, and they had ever been
The everlasting, why, ere Theban war
And obsequies of Troy, have other bards
Not also chanted other high affairs?
Whither have sunk so oft so many deeds
Of heroes? Why do those deeds live no more,
Ingrafted in eternal monuments
Of glory? Verily, I guess, because
The Sum is new, and of a recent date
The nature of our universe, and had
Not long ago its own exordium.
Wherefore, even now some arts are being still
Refined, still increased: now unto ships
Is being added many a new device;
And but the other day musician-folk
Gave birth to melic sounds of organing;
And, then, this nature, this account of things
Hath been discovered latterly, and I
Myself have been discovered only now,
As first among the first, able to turn
The same into ancestral Roman speech.