[PAULUS libro secundo ad edictum. ] §7.7.1.prOpera in actu consistit nec ante in rerum natura est, quam si dies uenit, quo praestanda est, quemadmodum cum stipulamur 'quod ex Arethusa natum erit'.
[PAULUS, in the second book on the Edict.] Labor consists in action and does not exist in the nature of things until the day arrives on which it is to be performed, just as when we stipulate for 'what shall be born of Arethusa'.