On the nature of things (books 1 - 3)   

Yet be't that these can last forever on:
They'll have the sense that's proper to a part,
Or else be judged to have a sense the same
As that within live creatures as a whole.
But of themselves those parts can never feel,
For all the sense in every member back
To something else refers- a severed hand,
Or any other member of our frame,
Itself alone cannot support sensation.
It thus remains they must resemble, then,
Live creatures as a whole, to have the power
Of feeling sensation concordant in each part
With the vital sense; and so they're bound to feel
The things we feel exactly as do we.
If such the case, how, then, can they be named
The primal germs of things, and how avoid
The highways of destruction?- since they be
Mere living things and living things be all
One and the same with mortal. Grant they could,
Yet by their meetings and their unions all,
Naught would result, indeed, besides a throng
And hurly-burly all of living things-
Precisely as men, and cattle, and wild beasts,
By mere conglomeration each with each
Can still beget not anything of new.
But if by chance they lose, inside a body,
Their own sense and another sense take on,
What, then, avails it to assign them that
Which is withdrawn thereafter? And besides,
To touch on proof that we pronounced before,
Just as we see the eggs of feathered fowls
To change to living chicks, and swarming worms
To bubble forth when from the soaking rains
The earth is sodden, sure, sensations all
Can out of non-sensations be begot.

But if one say that sense can so far rise
From non-sense by mutation, or because
Brought forth as by a certain sort of birth,
'Twill serve to render plain to him and prove
There is no birth, unless there be before
Some formed union of the elements,
Nor any change, unless they be unite.

In first place, senses can't in body be
Before its living nature's been begot,-
Since all its stuff, in faith, is held dispersed
About through rivers, air, and earth, and all
That is from earth created, nor has met
In combination, and, in proper mode,
Conjoined into those vital motions which
Kindle the all-perceiving senses- they
That keep and guard each living thing soever.

Again, a blow beyond its nature's strength
Shatters forthwith each living thing soe'er,
And on it goes confounding all the sense
Of body and mind. For of the primal germs
Are loosed their old arrangements, and, throughout,
The vital motions blocked,- until the stuff,
Shaken profoundly through the frame entire,
Undoes the vital knots of soul from body
And throws that soul, to outward wide-dispersed,
Through all the pores. For what may we surmise