On the nature of things (books 4 - 6)   

Either the skiey sun with baneful heats
Parches, or sudden rains or chilling rime
Destroys, or flaws of winds with furious whirl
Torment and twist. Beside these matters, why
Doth Nature feed and foster on land and sea
The dreadful breed of savage beasts, the foes
Of the human clan? Why do the seasons bring
Distempers with them? Wherefore stalks at large
Death, so untimely? Then, again, the babe,
Like to the castaway of the raging surf,
Lies naked on the ground, speechless, in want
Of every help for life, when Nature first
Hath poured him forth upon the shores of light
With birth-pangs from within the mother's womb,
And with a plaintive wail he fills the place,-
As well befitting one for whom remains
In life a journey through so many ills.
But all the flocks and herds and all wild beasts
Come forth and grow, nor need the little rattles,
Nor must be treated to the humouring nurse's
Dear, broken chatter; nor seek they divers clothes
To suit the changing skies; nor need, in fine,
Nor arms, nor lofty ramparts, wherewithal
Their own to guard- because the earth herself
And Nature, artificer of the world, bring forth
Aboundingly all things for all.

THE WORLD IS NOT ETERNAL

And first,
Since body of earth and water, air's light breath,
And fiery exhalations (of which four
This sum of things is seen to be compact)
So all have birth and perishable frame,
Thus the whole nature of the world itself
Must be conceived as perishable too.
For, verily, those things of which we see
The parts and members to have birth in time
And perishable shapes, those same we mark
To be invariably born in time
And born to die. And therefore when I see
The mightiest members and the parts of this
Our world consumed and begot again,
'Tis mine to know that also sky above
And earth beneath began of old in time
And shall in time go under to disaster.
And lest in these affairs thou deemest me
To have seized upon this point by sleight to serve
My own caprice- because I have assumed
That earth and fire are mortal things indeed,
And have not doubted water and the air
Both perish too and have affirmed the same
To be again begotten and wax big-
Mark well the argument: in first place, lo,
Some certain parts of earth, grievously parched
By unremitting suns, and trampled on
By a vast throng of feet, exhale abroad
A powdery haze and flying clouds of dust,
Which the stout winds disperse in the whole air.
A part, moreover, of her sod and soil
Is summoned to inundation by the rains;
And rivers graze and gouge the banks away.
Besides, whatever takes a part its own
In fostering and increasing aught...