[GAIUS libro nono ad edictum prouinciale. ] §50.17.42.prQui in alterius locum succedunt, iustam habent causam ignorantiae, an id quod peteretur deberetur.
[GAIUS, in his ninth book on the Provincial Edict.] Those who succeed to the place of another have a just cause of ignorance as to whether what is being claimed is owed.
fideiussores quoque non minus quam heredes iustam ignorantiam possunt allegare.
Sureties, no less than heirs, can allege just ignorance.
haec ita de herede dicta sunt, si cum eo agetur, non etiam si agat: nam plane qui agit, certus esse debet, cum sit in potestate eius, quando uelit experiri, et ante debet rem diligenter explorare et tunc ad agendum procedere.
This is so said of an heir if action is brought against him, but not also if he brings action: for clearly he who brings action ought to be certain, since it is in his power when he wishes to try the matter, and he ought beforehand to investigate the matter diligently and only then proceed to bring action.