[ULPIANUS libro trigensimo quarto ad Sabinum. ] §38.1.9.prOperae in rerum natura non sunt.
[ULPIANUS, in the thirty-fourth book on Sabinus.] Services do not exist in the nature of things.
§38.1.9.1Sed officiales quidem futurae nec cuiquam alii deberi possunt quam patrono, cum proprietas earum et in edentis persona et in eius cui eduntur constitit: fabriles autem aliaeue eius generis sunt, ut a quocumque cuicumque solui possint.
But future respect-services indeed cannot be owed to anyone other than the patron, since their essential character consists both in the person of the one who performs them and in the person of the one for whom they are performed; on the other hand, artisan-services or others of that kind are such that they can be performed by anyone to anyone.
sane enim, si in artificio sint, iubente patrono et alii edi possunt.
For indeed, if they consist in a skilled trade, they can, at the order of the patron, be performed for another person as well.