[IDEM libro uicensimo septimo ad Quintum Mucium. ] §12.6.52.prDamus aut ob causam aut ob rem: ob causam praeteritam, ueluti cum ideo do, quod aliquid a te consecutus sum uel quia aliquid a te factum est, ut, etiamsi falsa causa sit, repetitio eius pecuniae non sit: ob rem uero datur, ut aliquid sequatur, quo non sequente repetitio competit.
[THE SAME, in the twenty-seventh book on Quintus Mucius.] We give either on account of a cause or on account of a purpose: on account of a past cause, as for instance when I give for the reason that I have obtained something from you or because something has been done by you, so that, even if the cause be false, there is no recovery of that money; but a gift is made on account of a purpose so that something may follow, and if this does not follow, an action for recovery lies.