On the nature of things (books 1 - 3)   

That sense of mind is in no fixed part seated,
But is of body some one vital state,-
Named "harmony" by Greeks, because thereby
We live with sense, though intellect be not
In any part: as oft the body is said
To have good health (when health, however, 's not
One part of him who has it), so they place
The sense of mind in no fixed part of man.
Mightily, diversly, meseems they err.
Often the body palpable and seen
Sickens, while yet in some invisible part
We feel a pleasure; oft the other way,
A miserable in mind feels pleasure still
Throughout his body- quite the same as when
A foot may pain without a pain in head.
Besides, when these our limbs are given o'er
To gentle sleep and lies the burdened frame
At random void of sense, a something else
Is yet within us, which upon that time
Bestirs itself in many a wise, receiving
All motions of joy and phantom cares of heart.
Now, for to see that in man's members dwells
Also the soul, and body ne'er is wont
To feel sensation by a "harmony"
Take this in chief: the fact that life remains
Oft in our limbs, when much of body's gone;
Yet that same life, when particles of heat,
Though few, have scattered been, and through the mouth
Air has been given forth abroad, forthwith
Forever deserts the veins, and leaves the bones.
Thus mayst thou know that not all particles
Perform like parts, nor in like manner all
Are props of weal and safety: rather those-
The seeds of wind and exhalations warm-
Take care that in our members life remains.
Therefore a vital heat and wind there is
Within the very body, which at death
Deserts our frames. And so, since nature of mind
And even of soul is found to be, as 'twere,
A part of man, give over "harmony"-
Name to musicians brought from Helicon,-
Unless themselves they filched it otherwise,
To serve for what was lacking name till then.
Whate'er it be, they're welcome to it- thou,
Hearken my other maxims.
Mind and soul,
I say, are held conjoined one with other,
And form one single nature of themselves;
But chief and regnant through the frame entire
Is still that counsel which we call the mind,
And that cleaves seated in the midmost breast.
Here leap dismay and terror; round these haunts
Be blandishments of joys; and therefore here
The intellect, the mind. The rest of soul,
Throughout the body scattered, but obeys-
Moved by the nod and motion of the mind.
This, for itself, sole through itself, hath thought;
This for itself hath mirth, even when the thing
That moves it, moves nor soul nor body at all.
And as, when head or eye in us is smit
By assailing pain, we are not tortured then
Through all the body, so the mind alone
Is sometimes smitten, or livens with a joy,
Whilst yet the soul's remainder through the limbs