On the nature of things (books 1 - 3)   

That matter, too, by finite tale of shapes
Does differ. Again, from earth's midsummer heats
Unto the icy hoar-frosts of the year
The forward path is fixed, and by like law
O'ertravelled backwards at the dawn of spring.
For each degree of hat, and each of cold,
And the half-warm, all filling up the sum
In due progression, lie, my Memmius, there
Betwixt the two extremes: the things create
Must differ, therefore, by a finite change,
Since at each end marked off they ever are
By fixed point- on one side plagued by flames
And on the other by congealing frosts.

The which now having taught, I will go on
To bind thereto a fact to this allied
And drawing from this its proof: those primal germs
Which have been fashioned all of one like shape
Are infinite in tale; for, since the forms
Themselves are finite in divergences,
Then those which are alike will have to be
Infinite, else the sum of stuff remains
A finite- what I've proved is not the fact,
Showing in verse how corpuscles of stuff,
From everlasting and to-day the same,
Uphold the sum of things, all sides around
By old succession of unending blows.
For though thou view'st some beasts to be more rare,
And mark'st in them a less prolific stock,
Yet in another region, in lands remote,
That kind abounding may make up the count;
Even as we mark among the four-foot kind
Snake-handed elephants, whose thousands wall
With ivory ramparts India about,
That her interiors cannot entered be-
So big her count of brutes of which we see
Such few examples. Or suppose, besides,
We feign some thing, one of its kind and sole
With body born, to which is nothing like
In all the lands: yet now unless shall be
An infinite count of matter out of which
Thus to conceive and bring it forth to life,
It cannot be created and- what's more-
It cannot take its food and get increase.
Yea, if through all the world in finite tale
Be tossed the procreant bodies of one thing,
Whence, then, and where in what mode, by what power,
Shall they to meeting come together there,
In such vast ocean of matter and tumult strange?-
No means they have of joining into one.
But, just as, after mighty shipwrecks piled,
The mighty main is wont to scatter wide
The rowers' banks, the ribs, the yards, the prow,
The masts and swimming oars, so that afar
Along all shores of lands are seen afloat
The carven fragments of the rended poop,
Giving a lesson to mortality
To shun the ambush of the faithless main,
The violence and the guile, and trust it not
At any hour, however much may smile
The crafty enticements of the placid deep:
Exactly thus, if once thou holdest true
That certain seeds are finite in their tale,
The various tides of matter, then, must needs