[ULPIANUS libro quarto ad edictum. ] §2.14.1.prHuius edicti aequitas naturalis est.
[ULPIAN, On the Edict, book 4] The equity of this edict is natural.
quid enim tam congruum fidei humanae, quam ea quae inter eos placuerunt seruare?
For what is so agreeable to human good faith as to observe those things which they have agreed upon among themselves?
§2.14.1.1Pactum autem a pactione dicitur (inde etiam pacis nomen appellatum est) et est pactio duorum pluriumue in idem placitum et consensus.
Now, pactum is derived from pactio (whence also the name of peace is called), and pactio is the consent and agreement of two or more persons on the same matter.
§2.14.1.2Conuentionis uerbum generale est ad omnia pertinens, de quibus negotii contrahendi transigendique causa consentiunt qui inter se agunt: nam sicuti conuenire dicuntur qui ex diuersis locis in unum locum colliguntur et ueniunt, ita et qui ex diuersis animi motibus in unum consentiunt, id est in unam sententiam decurrunt.
The word conuentio is general, applying to all things concerning which those who transact business with one another consent for the purpose of contracting or settling a transaction. For just as those who are gathered and come from different places to one place are said conuenire, so too are those who, from different movements of the mind, consent to one thing, that is, arrive at one opinion.
adeo autem conuentionis nomen generale est, ut eleganter dicat Pedius nullum esse contractum, nullam obligationem, quae non habeat in se conuentionem, siue re siue uerbis fiat: nam et stipulatio, quae uerbis fit, nisi habeat consensum, nulla est.
Moreover, the name conuentio is so general that Pedius elegantly says that there is no contract, no obligation, which does not contain in itself a conuentio, whether it is made by act or by words; for even a stipulation, which is made by words, is null unless it has consent.
§2.14.1.3Sed conuentionum pleraeque in aliud nomen transeunt: ueluti in emptionem, in locationem, in pignus uel in stipulationem.
But most of the conuentiones pass over into another name: as into purchase, lease, pledge, or stipulation.