On the nature of things (books 4 - 6)   

What man is there whose mind with dread of gods
Cringes not close, whose limbs with terror-spell
Crouch not together, when the parched earth
Quakes with the horrible thunderbolt amain,
And across the mighty sky the rumblings run?
Do not the peoples and the nations shake,
And haughty kings do they not hug their limbs,
Strook through with fear of the divinities,
Lest for aught foully done or madly said
The heavy time be now at hand to pay?
When, too, fierce force of fury-winds at sea
Sweepeth a navy's admiral down the main
With his stout legions and his elephants,
Doth he not seek the peace of gods with vows,
And beg in prayer, a-tremble, lulled winds
And friendly gales?- in vain, since, often up-caught
In fury-cyclones, is he borne along,
For all his mouthings, to the shoals of doom.
Ah, so irrevocably some hidden power
Betramples forevermore affairs of men,
And visibly grindeth with its heel in mire
The lictors' glorious rods and axes dire,
Having them in derision! Again, when earth
From end to end is rocking under foot,
And shaken cities ruin down, or threaten
Upon the verge, what wonder is it then
That mortal generations abase themselves,
And unto gods in all affairs of earth
Assign as last resort almighty powers
And wondrous energies to govern all?

Now for the rest: copper and gold and iron
Discovered were, and with them silver's weight
And power of lead, when with prodigious heat
The conflagrations burned the forest trees
Among the mighty mountains, by a bolt
Of lightning from the sky, or else because
Men, warring in the woodlands, on their foes
Had hurled fire to frighten and dismay,
Or yet because, by goodness of the soil
Invited, men desired to clear rich fields
And turn the countryside to pasture-lands,
Or slay the wild and thrive upon the spoils.
(For hunting by pit-fall and by fire arose
Before the art of hedging the covert round
With net or stirring it with dogs of chase.)
Howso the fact, and from what cause soever
The flamy heat with awful crack and roar
Had there devoured to their deepest roots
The forest trees and baked the earth with fire,
Then from the boiling veins began to ooze
O rivulets of silver and of gold,
Of lead and copper too, collecting soon
Into the hollow places of the ground.
And when men saw the cooled lumps anon
To shine with splendour-sheen upon the ground,
Much taken with that lustrous smooth delight,
They 'gan to pry them out, and saw how each
Had got a shape like to its earthy mould.
Then would it enter their heads how these same lumps,
If melted by heat, could into any form
Or figure of things be run, and how, again,
If hammered out, they could be nicely drawn
To sharpest points or finest edge, and thus