Corpus Juris Civilis
The Corpus Juris Civilis or Body of Civil Law is a compendium of Roman law, issued between 529 and 534 by the Byzantine emperor Justinian I. It forms the ultimate basis of the civil law of most European jurisdictions.
The translations used here are by S. P. Scott. 
- Justitia est constans et perpetua voluntas jus suum cuique tribuens. Jurisprudentia est divinarum atque humanarum rerum notitia, justi atque injusti scientia.
- Justice is the constant and perpetual desire to give to each one that to which he is entitled. Jurisprudence is the knowledge of matters divine and human, and the comprehension of what is just and what is unjust.
- Institutes, Bk. 1, title 1. 
- Juris praecepta sunt haec: honeste vivere, alterum non laedere, suum cuique tribuere.
- The following are the precepts of the Law: to live honestly, not to injure another, and to give to each one that which belongs to him.
- Institutes, Bk. 1, title 1.
- Quod vero naturalis ratio inter omnes homines constituit, id apud omnes populos peraeque custoditur vocaturque jus gentium, quasi quo jure omnes gentes utuntur.
- Jure enim naturali ab initio omnes homines liberi nascebantur.
- According to Natural Law, all men were originally born free.
- Institutes, Bk. 1, title 2.
- Cuius merito quis nos sacerdotes appellet: justitiam namque colimus et boni et aequi notitiam profitemur, aequum ab iniquo separantes, licitum ab illicito discernentes, bonos non solum metu poenarum, verum etiam praemiorum quoque exhortatione efficere cupientes, veram nisi fallor philosophiam, non simulatam affectantes.
- Anyone may properly call us [lawyers] the priests of this art, for we cultivate justice and profess to know what is good and equitable, dividing right from wrong, and distinguishing what is lawful from what is unlawful; desiring to make men good through fear of punishment, but also by the encouragement of reward; aiming (if I am not mistaken) at a true, and not a pretended philosophy.
- Pandects, Bk. 1, title 1, section 1, quoting Ulpian, Institutes, Bk. 1. 
- Domus tutissimum cuique refugium atque receptaculum sit.
- Nulla injuria est, quae in volentem fiat.
- No injury is committed against one who consents.
- Pandects, Bk. 47, title 10, section 1, quoting Ulpian, On the Edict, Bk. 56. 
- Often quoted as "Volenti non fit injuria".
- Digna vox majestate regnantis legibus alligatum se principem profiteri: adeo de auctoritate juris nostra pendet auctoritas.