Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

There is indeed in mind that heat it gets
When seething in rage, and flashes from the eyes
More swiftly fire; there is, again, that wind,
Much, and so cold, companion of all dread,
Which rouses the shudder in the shaken frame;
There is no less that state of air composed,
Making the tranquil breast, the serene face.
But more of hot have they whose restive hearts,
Whose minds of passion quickly seethe in rage-
Of which kind chief are fierce abounding lions,
Who often with roaring burst the breast o'erwrought,
Unable to hold the surging wrath within;
But the cold mind of stags has more of wind,
And speedier through their inwards rouses up
The icy currents which make their members quake.
But more the oxen live by tranquil air,
Nor e'er doth smoky torch of wrath applied,
O'erspreading with shadows of a darkling murk,
Rouse them too far; nor will they stiffen stark,
Pierced through by icy javelins of fear;
But have their place half-way between the two-
Stags and fierce lions. Thus the race of men:
Though training make them equally refined,
It leaves those pristine vestiges behind
Of each mind's nature. Nor may we suppose
Evil can e'er be rooted up so far
That one man's not more given to fits of wrath,
Another's not more quickly touched by fear,
A third not more long-suffering than he should.
And needs must differ in many things besides
The varied natures and resulting habits
Of humankind- of which not now can I
Expound the hidden causes, nor find names
Enough for all the divers shapes of those
Primordials whence this variation springs.
But this meseems I'm able to declare:
Those vestiges of natures left behind
Which reason cannot quite expel from us
Are still so slight that naught prevents a man
From living a life even worthy of the gods.
     So then this soul is kept by all the body,
Itself the body's guard, and source of weal:
For they with common roots cleave each to each,
Nor can be torn asunder without death.
Not easy 'tis from lumps of frankincense
To tear their fragrance forth, without its nature
Perishing likewise: so, not easy 'tis
From all the body nature of mind and soul
To draw away, without the whole dissolved.
With seeds so intertwined even from birth,
They're dowered conjointly with a partner-life;
No energy of body or mind, apart,
Each of itself without the other's power,
Can have sensation; but our sense, enkindled
Along the vitals, to flame is blown by both
With mutual motions. Besides the body alone
Is nor begot nor grows, nor after death
Seen to endure. For not as water at times
Gives off the alien heat, nor is thereby
Itself destroyed, but unimpaired remains-
Not thus, I say, can the deserted frame
Bear the dissevering of its joined soul,
But, rent and ruined, moulders all away.
Thus the joint contact of the body and soul
Learns from their earliest age the vital motions,
Even when still buried in the mother's womb;
So no dissevering can hap to them,
Without their bane and ill. And thence mayst see
That, as conjoined is their source of weal,
Conjoined also must their nature be.