Venuleius, Stipulations, Book XII. If the usufructuary should obtain the property, the usufruct ceases to belong to him on account of the merger of the same; but if suit is brought against him on the stipulation, it must be held either that he has not proceeded in accordance with the strict principles of law, if the doctrine governing the conduct of a good citizen is considered applicable; or that the party must make use of an exception based on what has taken place.

Venuleius, Stipulations, Book XII. Where a slave forming part of an estate stipulates and receives sureties, and after the estate has been entered upon, a doubt arises whether the time begins to run from the date when the stipulation was made, or from the time when the estate was accepted, just as where a slave whose master is in the hands of the enemy has received sureties, Cassius thinks that the time should be computed from the date when proceedings can be instituted against the parties; that is to say, after the estate has been entered upon, or the master returns from captivity under the right of postliminium.

Venuleius, Stipulations, Book XII. No one can be considered dishonest who does not know how much he ought to pay.