But if there be an inclination or attraction, there will also be some benefit derived; for no existing thing attracts anything else for the mere sake of attracting, but in order to benefit by what is acquired by the attraction. And of course it cannot benefit by it if it cannot retain it. Herein, then, again, the retentive faculty is shown to have its necessary origin: for the stomach obviously inclines towards its own proper qualities and turns away from those that are foreign to it.[326] But if it aims at and attracts its food and benefits by it while retaining and contracting upon it, we may also expect that there will be some _termination_ to the benefit received, and that thereafter will come the time for the exercise of the eliminative faculty. VI Enesti de kai touto pollakis enargôs idein epi tôn apositôn; anankazomenoi gar esthiein oute katapinein eusthenousin out', ei kai biasainto, katechousin, all' euthys anemousi. kai hoi allôs de tôn edesmatôn pros hotioun dyscherainontes biasthentes eniote prosarasthai tacheôs exemousin, ê ei kataschoien biasamenoi, nautiôdeis t' eisi kai tês gastros hyptias aisthanontai kai speudousês apothesthai to lypoun. Houtôs ex hapantôn tôn phainomenôn, hoper ex archês errhethê, martyreitai to dein hyparchein tois tou zôou moriois schedon hapasin ephesin men tina kai hoion orexin tês oikeias poiotêtos, apostrophên de tina || kai 160 hoion misos ti tês allotrias, all' ephiemena men helkein eulogon, apostrephomena d' ekkrinein. Kak toutôn palin hê th' helktikê dynamis apodeiknytai kath' hapan hyparchousa kai hê proôstikê. All' eiper ephesis te tis esti kai helxis, eiê an tis kai apolausis; ouden gar tôn ontôn helkei ti di' auto to helkein, all' hin' apolausê tou dia tês holkês euporêthentos. kai mên apolauein ou dynatai mê kataschon. kan toutô palin hê kathektikê dynamis apodeiknytai tên genesin anankaian echousa; saphôs gar ephietai men tôn oikeiôn poiotêtôn hê gastêr, apostrephetai de tas allotrias. All' eiper ephietai te kai helkei kai apolauei katechousa kai peristellomenê, eiê an ti kai peras autê tês apolauseôs kapi tôd' ho kairos êdê tês ekkritikês dynameôs energousês. VII