On the nature of things (books 4 - 6)   

Of spoken sounds unheard before. And what,
At last, in this affair so wondrous is,
That human race (in whom a voice and tongue
Were now in vigour) should by divers words
Denote its objects, as each divers sense
Might prompt?- since even the speechless herds, aye, since
The very generations of wild beasts
Are wont dissimilar and divers sounds
To rouse from in them, when there's fear or pain,
And when they burst with joys. And this, forsooth,
'Tis thine to know from plainest facts: when first
Huge flabby jowls of mad Molossian hounds,
Baring their hard white teeth, begin to snarl,
They threaten, with infuriate lips peeled back,
In sounds far other than with which they bark
And fill with voices all the regions round.
And when with fondling tongue they start to lick
Their puppies, or do toss them round with paws,
Feigning with gentle bites to gape and snap,
They fawn with yelps of voice far other then
Than when, alone within the house, they bay,
Or whimpering slink with cringing sides from blows.
Again the neighing of the horse, is that
Not seen to differ likewise, when the stud
In buoyant flower of his young years raves,
Goaded by winged Love, amongst the mares,
And when with widening nostrils out he snorts
The call to battle, and when haply he
Whinnies at times with terror-quaking limbs?
Lastly, the flying race, the dappled birds,
Hawks, ospreys, sea-gulls, searching food and life
Amid the ocean billows in the brine,
Utter at other times far other cries
Then when they fight for food, or with their prey
Struggle and strain. And birds there are which change
With changing weather their own raucous songs-
As long-lived generations of the crows
Or flocks of rooks, when they be said to cry
For rain and water and to call at times
For winds and gales. Ergo, if divers moods
Compel the brutes, though speechless evermore,
To send forth divers sounds, O truly then
How much more likely 'twere that mortal men
In those days could with many a different sound
Denote each separate thing.
And now what cause
Hath spread divinities of gods abroad
Through mighty nations, and filled the cities full
Of the high altars, and led to practices
Of solemn rites in season- rites which still
Flourish in midst of great affairs of state
And midst great centres of man's civic life,
The rites whence still a poor mortality
Is grafted that quaking awe which rears aloft
Still the new temples of gods from land to land
And drives mankind to visit them in throngs
On holy days- 'tis not so hard to give
Reason thereof in speech. Because, in sooth,
Even in those days would the race of man
Be seeing excelling visages of gods
With mind awake; and in his sleeps, yet more-
Bodies of wondrous growth. And, thus, to these
Would men attribute sense, because they seemed
To move their limbs and speak pronouncements high,