Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     And much in these affairs demands inquiry,
And much, illumination- if we crave
With plainness to exhibit facts. And first,
Why doth the mind of one to whom the whim
To think has come behold forthwith that thing?
Or do the idols watch upon our will,
And doth an image unto us occur,
Directly we desire- if heart prefer
The sea, the land, or after all the sky?
Assemblies of the citizens, parades,
Banquets, and battles, these and all doth she,
Nature, create and furnish at our word?-
Maugre the fact that in same place and spot
Another's mind is meditating things
All far unlike. And what, again, of this:
When we in sleep behold the idols step,
In measure, forward, moving supple limbs,
Whilst forth they put each supple arm in turn
With speedy motion, and with eyeing heads
Repeat the movement, as the foot keeps time?
Forsooth, the idols they are steeped in art,
And wander to and fro well taught indeed,-
Thus to be able in the time of night
To make such games! Or will the truth be this:
Because in one least moment that we mark-
That is, the uttering of a single sound-
There lurk yet many moments, which the reason
Discovers to exist, therefore it comes
That, in a moment how so brief ye will,
The divers idols are hard by, and ready
Each in its place diverse? So great the swiftness,
So great, again, the store of idol-things,
And so, when perishes the former image,
And other is gendered of another pose,
The former seemeth to have changed its gestures.
And since they be so tenuous, mind can mark
Sharply alone the ones it strains to see;
And thus the rest do perish one and all,
Save those for which the mind prepares itself.
Further, it doth prepare itself indeed,
And hopes to see what follows after each-
Hence this result. For hast thou not observed
How eyes, essaying to perceive the fine,
Will strain in preparation, otherwise
Unable sharply to perceive at all?
Yet know thou canst that, even in objects plain,
If thou attendest not, 'tis just the same
As if 'twere all the time removed and far.
What marvel, then, that mind doth lose the rest,
Save those to which 'thas given up itself?
So 'tis that we conjecture from small signs
Things wide and weighty, and involve ourselves
In snarls of self-deceit.