[IULIANUS libro quinquagensimo tertio digestorum. ] §46.1.7.prQuod enim solutum repeti non potest, conueniens est huius naturalis obligationis fideiussorem accipi posse.
[JULIANUS in the fifty-third book of the Digests.] For since that which has been paid cannot be recovered, it is fitting that a surety can be accepted for this natural obligation.