Lucretius, De Rerum Natura
William Ellery Leonard, Ed.

     But if perchance the soul's to be adjudged
Immortal, mainly on ground 'tis kept secure
In vital forces- either because there come
Never at all things hostile to its weal,
Or else because what come somehow retire,
Repelled or ere we feel the harm they work,
     . . . . . .
For, lo, besides that, when the frame's diseased,
Soul sickens too, there cometh, many a time,
That which torments it with the things to be,
Keeps it in dread, and wearies it with cares;
And even when evil acts are of the past,
Still gnaw the old transgressions bitterly.
Add, too, that frenzy, peculiar to the mind,
And that oblivion of the things that were;
Add its submergence in the murky waves
Of drowse and torpor.