[POMPONIUS libro undecimo ad Sabinum. ] §21.2.27.prHoc iure utimur, ut exceptiones ex persona emptoris obiectae si obstant, uenditor ei non teneatur, si uero ad personam uenditoris respicient, contra: certe nec ex empto nec ex stipulatione duplae nec simplae actio competit emptori, si exceptio ei ex facto ipsius opposita obstiterit.
[POMPONIUS, On Sabinus, Book Eleven] We observe this rule of law, that if objections raised from the person of the buyer stand in his way, the seller is not liable to him; but if they relate to the person of the seller, the opposite is true. Certainly, neither an action on the purchase nor one on the stipulation for double or single value is available to the buyer, if an objection raised against him from his own act has stood in his way.