[POMPONIUS libro uicensimo secundo ad Sabinum. ] §41.10.3.prHominem, quem ex stipulatione te mihi debere falso existimabas, tradidisti mihi: si scissem mihi nihil debere, usu eum non capiam: quod si nescio, uerius est, ut usucapiam, quia ipsa traditio ex causa, quam ueram esse existimo, sufficit ad efficiendum, ut id quod mihi traditum est pro meo possideam.
[POMPONIUS, from his twenty-second book on Sabinus.] You delivered to me a slave whom you falsely believed you owed me on the basis of a stipulation: if I had known that you owed me nothing, I would not acquire him by usucapion; but if I did not know this, it is more correct that I should acquire him by usucapion, because the delivery itself, based on a cause which I believe to be true, is sufficient to bring it about that I possess what was delivered to me as my own.
et ita Neratius scripsit idque uerum puto.
And so Neratius wrote, and I think this is true.