Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     Once more, if thus, that every living thing
May have sensation, needful 'tis to assign
Sense also to its elements, what then
Of those fixed elements from which mankind
Hath been, by their peculiar virtue, formed?
Of verity, they'll laugh aloud, like men,
Shaken asunder by a spasm of mirth,
Or sprinkle with dewy tear-drops cheeks and chins,
And have the cunning hardihood to say
Much on the composition of the world,
And in their turn inquire what elements
They have themselves,- since, thus the same in kind
As a whole mortal creature, even they
Must also be from other elements,
And then those others from others evermore-
So that thou darest nowhere make a stop.
Oho, I'll follow thee until thou grant
The seed (which here thou say'st speaks, laughs, and thinks)
Is yet derived out of other seeds
Which in their turn are doing just the same.
But if we see what raving nonsense this,
And that a man may laugh, though not, forsooth,
Compounded out of laughing elements,
And think and utter reason with learn'd speech,
Though not himself compounded, for a fact,
Of sapient seeds and eloquent, why, then,
Cannot those things which we perceive to have
Their own sensation be composed as well
Of intermixed seeds quite void of sense?