[PAULUS libro tertio ad Sabinum. ] §16.2.4.prUerum est, quod et Neratio placebat et Pomponius ait, ipso iure eo minus fideiussorem ex omni contractu debere, quod ex compensatione reus retinere potest: sicut enim, cum totum peto a reo, male peto, ita et fideiussor non tenetur ipso iure in maiorem quantitatem quam reus condemnari potest.
[PAULUS, On Sabinus, Book III.] It is true, as was both pleasing to Neratius and Pomponius says, that by operation of law a surety owes so much less on any contract by the amount which the principal debtor can retain by way of set-off; for just as, when I demand the whole amount from the principal debtor, I make a bad claim, so also the surety is not liable by operation of law for a greater amount than that for which the principal debtor can be condemned.