In its course, it takes up certain specific elements and relations and lets others alone, without its being directly obvious what necessity there is in the matter. An external purpose controls this process.
Frogapenaren aurrerabideak determinazio eta harreman horiek jasotzen ditu eta besteak uzten ditu, bitartegabe ulertu gabe hori zein beharrezkotasunen arabera gertatzen den; kanpoko helburu batek gobernatzen du higidura hori.