[ULPIANUS libro sexto ad legem Iuliam et Papiam. ] §4.6.36.prRei publicae causa abesse eos solos intellegimus, qui non sui commodi causa, sed coacti absunt.
[ULPIANUS, On the Julian and Papian Law, Book VI] We understand that those alone are absent on public business who are absent not for their own benefit, but because they are compelled.