Caravaggio--Conversion on the Way to Damascus (Wikimedia Commons)
Three main categories of searches that are useful, whether searching in our catalog or in journal databases:
thematic searches, such as Paul's travels, Paul's conversion, Paul on marriage, or biography (most indexes use Paul, the Apostle, Saint or Paul, Saint, Apostle)
textual searches, where you'll look for writing about a particular literary unit, such as Romans or 1st Corinthians 13
genre searches; in this particular case, usually "the epistles of Paul"