[SCAEUOLA libro secundo digestorum. ] §50.1.24.prConstitutionibus principum continetur, ut pecuniae, quae ex detrimento soluitur, usurae non praestentur: et ita imperatores Antoninus et Uerus Augusti rescripserunt his uerbis: Humanum est reliquorum usuras neque ab ipso, qui ex administratione honoris reliquatus est, neque a fideiussore eius, et multo minus a magistratibus, qui cautionem acceperint, exigi.
[SCAEVOLA, Digests, Book II] It is provided in the constitutions of the emperors that interest is not to be paid on money which is paid on account of a deficit; and the Emperors Antoninus and Verus Augusti replied in these words: "It is humane that interest on arrears should not be exacted either from the person himself who has fallen into arrears from the administration of an office, or from his guarantor, and much less from the magistrates who received the security.
cui consequens est, ut ne in futurum a forma obseruata discedatur.
Consequently, there must be no departure in the future from the observed rule."