[MARCIANUS libro secundo regularum. ] §4.8.51.prSi de re sua quis arbiter factus sit, sententiam dicere non potest, quia se facere iubeat aut petere prohibeat: neque autem imperare sibi neque se prohibere quisquam potest.
[MARCIANUS in his second book of Rules.] If anyone is made an arbitrator in his own case, he cannot pronounce an award, because he would be ordering himself to act or forbidding himself to make a claim; but no one can command himself or forbid himself.