On the nature of things (books 1 - 3)   

Should slice it down the middle and cleave in twain,
Beyond a doubt likewise the soul itself,
Divided, dissevered, asunder will be flung
Along with body. But what severed is
And into sundry parts divides, indeed
Admits it owns no everlasting nature.
We hear how chariots of war, areek
With hurly slaughter, lop with flashing scythes
The limbs away so suddenly that there,
Fallen from the trunk, they quiver on the earth,
The while the mind and powers of the man
Can feel no pain, for swiftness of his hurt,
And sheer abandon in the zest of battle:
With the remainder of his frame he seeks
Anew the battle and the slaughter, nor marks
How the swift wheels and scythes of ravin have dragged
Off with the horses his left arm and shield;
Nor other how his right has dropped away,
Mounting again and on. A third attempts
With leg dismembered to arise and stand,
Whilst, on the ground hard by, the dying foot
Twitches its spreading toes. And even the head,
When from the warm and living trunk lopped off,
Keeps on the ground the vital countenance
And open eyes, until 't has rendered up
All remnants of the soul. Nay, once again:
If, when a serpent's darting forth its tongue,
And lashing its tail, thou gettest chance to hew
With axe its length of trunk to many parts,
Thou'lt see each severed fragment writhing round
With its fresh wound, and spattering up the sod,
And there the fore-part seeking with the jaws
After the hinder, with bite to stop the pain.
So shall we say that these be souls entire
In all those fractions?- but from that 'twould follow
One creature'd have in body many souls.
Therefore, the soul, which was indeed but one,
Has been divided with the body too:
Each is but mortal, since alike is each
Hewn into many parts. Again, how often
We view our fellow going by degrees,
And losing limb by limb the vital sense;
First nails and fingers of the feet turn blue,
Next die the feet and legs, then o'er the rest
Slow crawl the certain footsteps of cold death.
And since this nature of the soul is torn,
Nor mounts away, as at one time, entire,
We needs must hold it mortal. But perchance
If thou supposest that the soul itself
Can inward draw along the frame, and bring
Its parts together to one place, and so
From all the members draw the sense away,
Why, then, that place in which such stock of soul
Collected is, should greater seem in sense.
But since such place is nowhere, for a fact,
As said before, 'tis rent and scattered forth,
And so goes under. Or again, if now
I please to grant the false, and say that soul
Can thus be lumped within the frames of those
Who leave the sunshine, dying bit by bit,
Still must the soul as mortal be confessed;
Nor aught it matters whether to wrack it go,
Dispersed in the winds, or, gathered in a mass
From all its parts, sink down to brutish death,