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How did the Digest change the use of earlier Roman jurists’ writings?

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Mosaic detail of Emperor Justinian I with a jeweled crown and halo, wearing ornate robes, from the Church of San Vitale in Ravenna, Italy. — Justinian I Justinian I, detail of a mosaic in the Church of San Vitale, Ravenna, Italy.

The Digest, or Pandectae, fundamentally transformed the use of earlier Roman jurists' writings by consolidating them into a single, authoritative legal framework. Before this compilation, the writings of jurists were often scarce, lost, inconsistent, or of doubtful authenticity.1

Justinian I appointed a commission of 16 eminent lawyers to compile, clarify, simplify, and order these vast and disorganized treatises. Once the Digest was enacted as a formal lawbook in 533 CE, Justinian took the definitive step of repealing all other existing laws contained in the original treatises of the jurists.1

Furthermore, he strictly prohibited the future citation of those original treatises, even for the purpose of illustration. By doing so, Justinian replaced the fragmented and contradictory mass of historical legal commentary with a unified, binding text that became a central component of the Corpus Juris Civilis.1