[ULPIANUS libro quadragensimo septimo ad Sabinum. ] §2.5.3.prCum quis in iudicio sisti promiserit neque adiecerit poenam, si status non esset: incerti cum eo agendum esse in id quod interest uerissimum est, et ita Celsus quoque scribit.
[ULPIANUS, in the forty-seventh book on Sabinus.] When anyone has promised to appear in court and has not added a penalty in case he should not have appeared, it is most true that an action for an uncertain amount must be brought against him for his interest, and Celsus also writes thus.