Ammianus Marcellinus 27.4.14 (tr. J.C. Rolfe):
Now it is well known, as constant reports have spread abroad, that almost all the country folk who dwell in the high mountains throughout the lands just described surpass us in health and strength, and in the prerogative (so to speak) of prolonging life; and it is thought that this is due to abstinence from a conglomeration of diet and from hot baths, and a lasting freshness knits their bodies through cold sprinklings with dew; and they enjoy the sweetness of a purer air; further they are first of all to feel the rays of the sun, which are by their own nature life-giving, before they are infected with any stains from human affairs.
Constat autem (ut vulgavere rumores assidui), omnes paene agrestes, qui per regiones praedictas montium circumcolunt altitudines, salubritate virium, et praerogativa quadam vitae longius propagandae, nos anteire, idque inde contingere arbitrantur, quod colluvione ciborum abstinent calidisque, et perenni viriditate roris asperginibus gelidis corpora constringente, aurae purioris dulcedine potiuntur, radiosque solis, suapte natura vitales, primi omnium sentiunt, nullis adhuc maculis rerum humanarum infectos.
Portion of critical apparatus from Wolfgang Seyfarth's Teubner edition:
