Just as the natural heat spread through the human limbs, being suddenly assailed and surrounded by the rigid cold, and constricted by the insuperable, stinging cold — its opposite and mortal enemy — is thereupon terrified and runs back through the trembling walls; and, like a faithful constable and guardian of life, goes providing for and fortifying every weak part and shutting up every rarity and porosity that might be there; and, unable to resist any longer, gathers all its force into itself, leaving the conquered walls in the hand of the striking enemy, and takes refuge close to the heart, castellan and guard of the vital fortress, and there, its forces redoubled, waits from afar to contend with the rigid enemy... Just as the natural heat spread through the human limbs, being suddenly assailed, surrounded and constricted by the rigid cold, and unable to resist, at once shuts against it the porous entrances of the beaten and trembling walls, and with its gathered forces takes refuge near the heart, castellan and guard of the vital fortress, there resisting as much as it can from afar — so these [vapours], at their first contact with the cold region, because of the heat mixed among them, begin to resist, and the heat abandons their extremities, which close up and become denser.

One braccio.

There is a thing that, the more one has need of it, the more it is refused: and this is counsel, listened to unwillingly by those who most need it, that is, by the ignorant. — There is a thing that, the more you fear it and flee it, the closer you draw it to you: and this is misery, for the more you flee it, the more you make yourself wretched and without rest.