Lanfranc brought law and discipline; Anselm brought theology and philosophy.
Berengar's belief was not shaken by their arguments and exhortations, and hearing that Lanfranc, the most celebrated theologian of that age, strongly approved the doctrine of Paschasius and condemned that of " Scotus " (really Ratramnus), he wrote to him a letter expressing his surprise and urging him to reconsider the question.
The letter, arriving at Bec when Lanfranc was absent at Rome (1050), was sent after him, but was opened before it reached him, and Lanfranc, fearing the scandal, brought it under the notice of Pope Leo IX.
The opinions of Berengar are to be ascertained from the works written in refutation of them by Adelmann, Lanfranc, Guitmund, &c. from the fragments of the De sacr.
Though designed for a public career Lanfranc had the tastes of a student.