built precisely around patristic citations to the Old Latin Bible and is searchable by book - chapter - verse. If the verse is Greek, search by phrase and lemma in TLG. The TLG supports word-index, lemma, textual, and proximity searching. That matters because patristic citation is often partial, inflected, or reordered. Use a short distinctive sequence first; then broaden with lemma or proximity. If the verse is Latin, search LLT with both exact forms and lemmas. The LLT is built from leading editions and supports lemma expansion. That makes it ideal for finding verbal reuse in Latin commentaries, homilies, treatises, and medieval texts where the exact biblical phrase has been morphologically altered. Identify the exact work, not just the author. Once you have an author and approximate location, go to Clavis Clavium and confirm the exact work through title, incipit, desinit, author, or saint fields. For Latin works, record the CPL number; for Greek, the CPG number . This is especially important for anonymous works, pseudo-attributions, fragment collections, and catena materials. Determine whether the passage is a primary commentary, a homily, a treatise, or a catena fragment. This changes how you use it. A catena snippet may preserve a lost authorial fragment, but it may also abbreviate or reframe the source. A dogmatic work may contain only a passing proof text, while a homily may offer extensive sequential interpretation without ever being titled “commentary.” Move from public-domain witness to best edition. Once you know the work, check whether a modern critical edition exists in CCSL, CCSG, CSEL, Sources Chrétiennes, or GCS. Use PL/PG, Patristica.net, Internet Archive, or Google Books for access and reconnaissance; use the modern edition for serious citation or philological argument. For medieval Latin commentaries, switch tools early. If the trail leads beyond late antiquity, move quickly to Repertorium Biblicum Medii Aevi and, for glossed biblical tradition, to GlossaOrdinaria.net and Gloss-e related resources. Medieval commentary traditions are too large and too manuscript-driven to be handled well by patristic-only indexes. Read around the hit before using it. A verse occurrence does not prove that the verse is being exegeted. It may be liturgical, rhetorical, mnemonic, doctrinal, or merely incidental. BiblIndex itself notes that the quotation/allusion distinction is not fully objective. 26 4. 36 5. 37 6. 38 7. 39 8. 40 9. 41 10. 42 9