De Rerum Natura

From this thou mayest conjecture of what sort

The ceaseless tossing of primordial seeds

Amid the mightier void- at least so far

As small affair can for a vaster serve,

And by example put thee on the spoor

Of knowledge. For this reason too 'tis fit

Thou turn thy mind the more unto these bodies

Which here are witnessed tumbling in the light:

Namely, because such tumblings are a sign

That motions also of the primal stuff

Secret and viewless lurk beneath, behind.

For thou wilt mark here many a speck, impelled

By viewless blows, to change its little course,

And beaten backwards to return again,

Hither and thither in all directions round.

Lo, all their shifting movement is of old,

From the primeval atoms; for the same

Primordial seeds of things first move of self,

And then those bodies built of unions small

And nearest, as it were, unto the powers

Of the primeval atoms, are stirred up

By impulse of those atoms' unseen blows,

And these thereafter goad the next in size:

Thus motion ascends from the primevals on,

And stage by stage emerges to our sense,

Until those objects also move which we

Can mark in sunbeams, though it not appears

What blows do urge them.

Now what the speed to matter's atoms given

Thou mayest in few, my Memmius, learn from this:

When first the dawn is sprinkling with new light

The lands, and all the breed of birds abroad

Flit round the trackless forests, with liquid notes

Filling the regions along the mellow air,

We see 'tis forthwith manifest to man

How suddenly the risen sun is wont

At such an hour to overspread and clothe

The whole with its own splendour; but the sun's

Warm exhalations and this serene light

Travel not down an empty void; and thus

They are compelled more slowly to advance,

Whilst, as it were, they cleave the waves of air;

Nor one by one travel these particles

Of the warm exhalations, but are all

Entangled and enmassed, whereby at once

Each is restrained by each, and from without

Checked, till compelled more slowly to advance.

But the primordial atoms with their old

Simple solidity, when forth they travel

Along the empty void, all undelayed

By aught outside them there, and they, each one

Being one unit from nature of its parts,

Are borne to that one place on which they strive

Still to lay hold, must then, beyond a doubt,

Outstrip in speed, and be more swiftly borne

Than light of sun, and over regions rush,

Of space much vaster, in the self-same time

The sun's effulgence widens round the sky.

. . . . . .

Nor to pursue the atoms one by one,

To see the law whereby each thing goes on.

But some men, ignorant of matter, think,

Opposing this, that not without the gods,

In such adjustment to our human ways,

Can nature change the seasons of the years,

And bring to birth the grains and all of else

To which divine Delight, the guide of life,

Persuades mortality and leads it on,

That, through her artful blandishments of love,

It propagate the generations still,

Lest humankind should perish. When they feign

That gods have stablished all things but for man,

They seem in all ways mightily to lapse

From reason's truth: for ev'n if ne'er I knew

What seeds primordial are, yet would I dare

This to affirm, ev'n from deep judgment based

Upon the ways and conduct of the skies-

This to maintain by many a fact besides-

That in no wise the nature of the world

For us was builded by a power divine-

So great the faults it stands encumbered with:

The which, my Memmius, later on, for thee

We will clear up. Now as to what remains

Concerning motions we'll unfold our thought.

Now is the place, meseems, in these affairs

To prove for thee this too: nothing corporeal

Of its own force can e'er be upward borne,

Or upward go- nor let the bodies of flames

Deceive thee here: for they engendered are

With urge to upwards, taking thus increase,

Whereby grow upwards shining grains and trees,

Though all the weight within them downward bears.

Nor, when the fires will leap from under round

The roofs of houses, and swift flame laps up

Timber and beam, 'tis then to be supposed

They act of own accord, no force beneath

To urge them up. 'Tis thus that blood, discharged

From out our bodies, spurts its jets aloft

And spatters gore. And hast thou never marked

With what a force the water will disgorge