|Dig.1.1.9 Gaius 1 inst.
populi, qui legibus et moribus reguntur, partim suo proprio, partim communi
omnium hominum iure utuntur. (All
peoples who are ruled by laws and long-standing custom partly use their own
laws and partly the law that is common to all men)
Dig.126.96.36.199 Ulpianus 1 reg. Iuris praecepta sunt haec: honeste vivere, alterum non laedere, suum cuique tribuere (The commands of law are these: to live honestly, to not injure <the rights> of others, and to give to each person his <Ius>).
Dig.188.8.131.52 Ulpianus 1 reg. Iuris prudentia est divinarum atque humanarum rerum notitia, iusti atque iniusti scientia. (Jurisprudence is the understanding of divine and human affairs, and the the skill of recognizing justice and injustice).