and we distinguish the law that merely furnishes a principle of obligation from that which is really obligatory (leges obligandi a legibus obligantibus); as, for instance, the law of what men's wants require from me, as contrasted with that which their rights demand, the latter of which prescribes essential, the former only non-essential duties; and thus we teach how to distinguish different kinds of duties which meet in the same action.
eta lotespenaren oinarria baino ematen ez duen legeari arreta egitatean lotzaile den legeari emandakotik ezberdintzen da (leges obligandi a legibus obligantibus), (esaterako, gizakiaren premiak nigandik eskatzen duenaren legea horren eskubideak eskatzen duenaren aldean, azkenak funtsezko betebeharrak, lehenak funtsezkoak ez direnak ezarriz) eta horrela ekintza batean elkartzen diren hainbat betebehar ezberdintzen irakasten du.