information:highlighting, quality:correction
Theological works

In his own time, Bede was as well known for his biblical commentaries, and for his exegetical and other theological works. The majority of his writings were of this type and covered the Old Testament and the New Testament. Most survived the Middle Ages, but a few were lost. It was for his theological writings that he earned the title of Doctor Anglorum and why he was declared a saint.

Bede synthesised and transmitted the learning from his predecessors, as well as made careful, judicious innovation in knowledge (such as recalculating the age of the Earth—for which he was censured before surviving the heresy accusations and eventually having his views championed by Archbishop Ussher in the sixteenth century—see below) that had theological implications. In order to do this, he learned Greek and attempted to learn Hebrew. He spent time reading and rereading both the Old and the New Testaments. He mentions that he studied from a text of Jerome 's Vulgate, which itself was from the Hebrew text.

He also studied both the Latin and the Greek Fathers of the Church. In the monastic library at Jarrow were numerous books by theologians, including works by Basil, Cassian, John Chrysostom, Isidore of Seville, Origen, Gregory of Nazianzus, Augustine of Hippo, Jerome, Pope Gregory I, Ambrose of Milan, Cassiodorus, and Cyprian. He used these, in conjunction with the Biblical texts themselves, to write his commentaries and other theological works.

He had a Latin translation by Evagrius of Athanasius 's Life of Antony and a copy of Sulpicius Severus ' Life of St Martin. He also used lesser known writers, such as Fulgentius, Julian of Eclanum, Tyconius, and Prosper of Aquitaine. Bede was the first to refer to Jerome, Augustine, Pope Gregory and Ambrose as the four Latin Fathers of the Church. It is clear from Bede's own comments that he felt his calling was to explain to his students and readers the theology and thoughts of the Church Fathers.

Bede also wrote homilies, works written to explain theology used in worship services. He wrote homilies on the major Christian seasons such as Advent, Lent, or Easter, as well as on other subjects such as anniversaries of significant events.

Both types of Bede's theological works circulated widely in the Middle Ages. Several of his biblical commentaries were incorporated into the Glossa Ordinaria, an 11th-century collection of biblical commentaries. Some of Bede's homilies were collected by Paul the Deacon, and they were used in that form in the Monastic Office. Boniface used Bede's homilies in his missionary efforts on the continent.

Bede sometimes included in his theological books an acknowledgement of the predecessors on whose works he drew. In two cases he left instructions that his marginal notes, which gave the details of his sources, should be preserved by the copyist, and he may have originally added marginal comments about his sources to others of his works. Where he does not specify, it is still possible to identify books to which he must have had access by quotations that he uses. A full catalogue of the library available to Bede in the monastery cannot be reconstructed, but it is possible to tell, for example, that Bede was very familiar with the works of Virgil.

There is little evidence that he had access to any other of the pagan Latin writers—he quotes many of these writers, but the quotes are almost always found in the Latin grammars that were common in his day, one or more of which would certainly have been at the monastery. Another difficulty is that manuscripts of early writers were often incomplete: it is apparent that Bede had access to Pliny's Encyclopaedia, for example, but it seems that the version he had was missing book xviii, since he did not quote from it in his De temporum ratione.

Bede's works included Commentary on Revelation, Commentary on the Catholic Epistles, Commentary on Acts, Reconsideration on the Books of Acts, On the Gospel of Mark, On the Gospel of Luke, and Homilies on the Gospels. At the time of his death he was working on a translation of the Gospel of John into English. He did this for the last 40 days of his life. When the last passage had been translated he said: "All is finished." The works dealing with the Old Testament included Commentary on Samuel, Commentary on Genesis, Commentaries on Ezra and Nehemiah, On the Temple, On the Tabernacle, Commentaries on Tobit, Commentaries on Proverbs, Commentaries on the Song of Songs, Commentaries on the Canticle of Habakkuk. The works on Ezra, the tabernacle and the temple were especially influenced by Gregory the Great's writings.