[IDEM libro quarto disputationum. ] §50.12.3.prPactum est duorum consensus atque conuentio, pollicitatio uero offerentis solius promissum.
[THE SAME, in the fourth book of Disputations.] A pact is the consent and agreement of two persons, whereas a unilateral promise is the promise of the offeror alone.
et ideo illud est constitutum, ut, si ob honorem pollicitatio fuerit facta, quasi debitum exigatur.
And therefore it has been established that, if a unilateral promise was made for the sake of an honor, it may be demanded as if it were a debt.
sed et coeptum opus, licet non ob honorem promissum, perficere promissor eo cogetur, et est constitutum.
But also, with regard to a work already begun, even if it was not promised for the sake of an honor, the promisor shall be compelled by this to complete it, and so it has been established.
§50.12.3.1Si quis quam ex pollicitatione tradiderat rem municipibus uindicare uelit, repellendus est a petitione: aequissimum est enim huiusmodi uoluntates in ciuitates collatas paenitentia non reuocari.
If anyone should wish to claim any thing which he had delivered to the citizens of a municipality in consequence of a unilateral promise, he must be repelled from his petition; for it is most equitable that intentions of this kind, directed towards states, should not be revoked by a change of mind.
sed et si desierint municipes possidere, dicendum erit actionem eis concedendam.
But even if the citizens should cease to possess it, it must be said that an action should be granted to them.