6 Nor was Jerome content merely to gather up this or that teacher's words; he gathered from all quarters whatever might prove of use to him in this task. From the outset he had accumulated the best possible copies of the Bible and the best commentators on it, but now he worked on copies from the synagogues and from the library formed at Caesarea by Origen and Eusebius; he hoped by assiduous comparison of texts to arrive at greater certainty touching the actual text and its meaning. With this same purpose he went all through Palestine. For he was thoroughly convinced of the truth of what he once wrote to Domnio and Rogatian: A man will understand the Bible better if he has seen Judaea with his own eyes and discovered its ancient cities and sites either under the old names or newer ones. In company with some learned Hebrews I went through the entire land the names of whose sites are on every Christian's lips.
Source: Spiritus Paraclitus (Vatican.va)