[Ulpianus libro quinto ad edictum. ] §19.2.41.prSed de damno ab alio dato agi cum eo non posse Iulianus ait: qua enim custodia consequi potuit, ne damnum iniuria ab alio dari possit? sed Marcellus interdum esse posse ait, siue custodiri potuit, ne damnum daretur, siue ipse custos damnum dedit: quae sententia Marcelli probanda est.
[ULPIANUS, from the fifth book on the Edict.] But Julian says that an action cannot be brought against him for damage caused by another; for by what kind of custody could it be achieved that unlawful damage might not be caused by another? But Marcellus says that sometimes it is possible, either if it could have been prevented by custody so that damage would not be caused, or if the custodian himself caused the damage; and this opinion of Marcellus is to be approved.