Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     Now come; with what swift motion they are borne,
These images, and what the speed assigned
To them across the breezes swimming on-
So that o'er lengths of space a little hour
Alone is wasted, toward whatever region
Each with its divers impulse tends- I'll tell
In verses sweeter than they many are;
Even as the swan's slight note is better far
Than that dispersed clamour of the cranes
Among the southwind's aery clouds. And first,
One oft may see that objects which are light
And made of tiny bodies are the swift;
In which class is the sun's light and his heat,
Since made from small primordial elements
Which, as it were, are forward knocked along
And through the interspaces of the air
To pass delay not, urged by blows behind;
For light by light is instantly supplied
And gleam by following gleam is spurred and driven.
Thus likewise must the images have power
Through unimaginable space to speed
Within a point of time,- first, since a cause
Exceeding small there is, which at their back
Far forward drives them and propels, where, too,
They're carried with such winged lightness on;
And, secondly, since furnished, when sent off,
With texture of such rareness that they can
Through objects whatsoever penetrate
And ooze, as 'twere, through intervening air.