Moreover, to say that the eyes can discern nothing, but that the mind looks out through them as through open portals, is difficult, when their own feeling leads us to the opposite conclusion; for it is their feeling that draws us and pushes us on to the very eyeballs; especially since we are often unable to perceive glaring objects because our bright eyes are hindered by the brightness …Footnote 1
A conjecture made by Lambinus in 1565 proposes replacement of difficilest (present in the three authoritative manuscripts O, Q and V) at 3.361 with desiperest.Footnote 2 Although commonly printed until the end of the nineteenth century (including in Lachmann's famous edition and Heinze's edition of Book 3, but excluding Wakefield's and Munro's), in the twentieth century the conjecture fell out of favour, both in editions of the entire De rerum natura (DRN) and of Book 3; the manuscript reading of difficilest has been kept by editors since 1900: Duff, Bailey, Martin, Kenney, Müller, Smith and Brown.Footnote 3 But with this consensus there are problems, and there are several reasons for preferring Lambinus' conjecture.Footnote 4
The normal usage of dicere and Lucretius' own practice lead me to conclude that the expression as transmitted is incorrect. The sentence begins with dicere and is completed in sense by difficilest.Footnote 5 In order for it to make sense, the sentence construction relies upon an understanding of dicere as ‘argue’, ‘declare’, ‘make definite’, or similar. But this use of dicere is seen rarely, and not at all with an accusative and infinitive construction.Footnote 6 Here, it is most likely to convey simply, ‘say’. dicere … difficilest is awkward here unless the author is referring to a specific instance of a physical difficulty with speech – which he is not.Footnote 7 Bailey's translation of dicere as ‘maintain’ might improve the expression, but it is therefore unlikely.Footnote 8 The point of these lines is not that it is difficult to express a particular theory, or even that it is difficult to reason or to assert (were we to accept this unusual interpretation of dicere). Rather, Lucretius rejects the very notion that the eyes are mere windows through which the soul sees, stating instead that it is they which allow sight. The assertion here is that the reasoning does not make sense at all.
In addition to reasons of sense and normal Latin usage, the use of desiperest is far more in accordance with Lucretius' argumentative strategy. Lucretius finishes his refutation of the ‘doorway’ theory of ocular vision at 3.359–66 with a reductio ad absurdum at 3.367–9: if the eyes are mere doors, why not remove them altogether, by which people might see even more clearly? The escalating verbs ducat … trahit … detrudit (3.361–2) are combined with the polyptoton of lumina luminibus (3.364) and the use of acies (3.362), whose primary sense is ‘blade’ (when oculos would have scanned), to draw the reader towards a vivid realization of the pain felt in the eyes at light which is too bright.Footnote 9 Here, Lucretius builds up to his reductio ad absurdum, and it can be no coincidence that the solution suggested for adherents to the theory is a painful one, namely, removal of the eyes (exemptis oculis, 3.368). On argumentative and rhetorical grounds, desiperest is much more suited to the argument at this point in the text, for it acts as a signpost to the idiocy of those who would propose, and adhere to, such a theory.
On examination of Lucretius' use of Latin more generally, one finds that although dicere is never seen with difficile(st), facile(st) or non/haud facile(st) in DRN,Footnote 10 it is seen with desiperest. Each coincidence of dicere and desiperest occurs in an infinitive construction and in a similar context to the argument found at 3.359–64, where Lucretius disparages or derides a philosophical view which is at variance with Epicurean teachings. At 3.359–69, the refutation of the ‘doorway’ theory is an illustration of the argument at 3.350–8 that the body has sensus; itself part of the broader point that the soul and body are united (3.323–69), and which, in turn, leads to the crux of the matter: the soul will die along with the body (3.434–44).Footnote 11 Later, the same construction of dicere … desiperest is used three times: first where Lucretius argues against the immortality of the soul by claiming that the immortal soul cannot be part of something mortal (3.800–2); secondly where he dismisses a fear of blasphemy, and even uses the construction dicere porro … desiperest (5.156–65); and thirdly where he disputes the notion of a single being who invented the nomina rerum (5.1041–3). Bailey uses these examples to strengthen a case against Lambinus' conjecture, where in fact they defend it: the sentence structure and vocabulary of the conjecture is more in keeping with Lucretius' style, and the similar contexts of every other occurrence (especially the example at 5.156–65) increase this possibility.Footnote 12 The correspondences in the text are striking, even down to the enjambment occurring alongside desiperest, which is seen also at 3.361. The appearance of dicere at two other points in DRN together with vocabulary pertaining to madness or foolishness strengthens this argument further: dicere porro … perdelirum esse videtur (1.690–2), and aequa videtur enim dementia dicere utrumque (1.704).Footnote 13 These examples form part of a refutation of the belief in fire as the fundamental element (1.690–704), as well as making a broader criticism of those who ignore the evidence provided by their senses. Here, as at 3.359–69, one finds Lucretius building up to an accusation of idiocy at the end of his rational argument. His fondness for using the language of madness where people neglect the evidence of their own senses is clear:
The language here, especially of 1.693, is very close to the language of 3.361–2:
Knowledge of Lucretius' rhetorical strategy and of the normal usage of the Latin words in question render Lambinus' desiperest more suited to the argument than the unsatisfactory and rather bland difficilest of the manuscript tradition. Lambinus' desiperest entirely befits the indignant and ironic tone of Lucretius' arguments at this point.