Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     But now, what is't that strikes thy sceptic mind,
Constraining thee to sundry arguments
Against belief that from insensate germs
The sensible is gendered?- Verily,
'Tis this: that liquids, earth, and wood, though mixed,
Are yet unable to gender vital sense.
And, therefore, 'twill be well in these affairs
This to remember: that I have not said
Senses are born, under conditions all,
From all things absolutely which create
Objects that feel; but much it matters here
Firstly, how small the seeds which thus compose
The feeling thing, then, with what shapes endowed,
And lastly what they in positions be,
In motions, in arrangements. Of which facts
Naught we perceive in logs of wood and clods;
And yet even these, when sodden by the rains,
Give birth to wormy grubs, because the bodies
Of matter, from their old arrangements stirred
By the new factor, then combine anew
In such a way as genders living things.
     Next, they who deem that feeling objects can
From feeling objects be create, and these,
In turn, from others that are wont to feel
     . . . . . .
When soft they make them; for all sense is linked
With flesh, and thews, and veins- and such, we see,
Are fashioned soft and of a mortal frame.
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Which is withdrawn thereafter?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.