John Trapp on Job 15:2

Verſe 2. Should a wiſe man utter vain knowledg.] Heb. Knowledg of the wind; light, frothy, empty diſcourſes, that have no tack or ſubſtance in them, but only words that are no better then wind, a meer flaſh or Aiery nothing. Solomon thinks, a wiſe man ſhould beware of falling into this fault, leſt he forfeit his reputation, Eccleſ. 10.1. Dead flyes cauſe the Oyntments of the Apothecary to ſend forth a ſtinking ſavour. ſo doth a little folly, him that is in reputation for wiſdom and honour; as ſpots are ſooneſt obſerved in the whiteſt and fineſt garments; and envy, like wormes and moths, doth uſually feed on the pureſt cloth. Neh. 6.11. A great many dead flies may be found in a Tar-box, and no hurt done, but one of them falne into a pot of ſweet Odours, or precious Perfumes, may ſoone taint and corrupt them.

And fil his belly with the Eaſt-wind.] Per ventrem, mentem intellige, & per ventum Orientalem, vanam opinionem, ſaith Vatablus; By belly underſtand the mind, and by the Eaſt wind a vain conceit, or frothy knowledg, blown forth out of a ſwelling breaſt, to the hurt of others, for the Eaſt wind is deſtructive to herbs and fruits. Hoſ. 12.1. Gen. 41.6. But doth not Eliphaz here by theſe bubble of words, and bluſtering queſtions, betraying much choler and confidence, fall into the very ſame fault which he findeth with Job: Doth not he alſo fill his belly with heat. (ſo the Vulgar rendreth this Text) which kindling in his boſom, blazeth out at his lips? Doth not this angry man exalt folly, and ſhew himſelf none of the wiſeſt, though he were the oldeſt in all the company.