Page "Eusebius" Paragraph 12

Of the extensive literary activity of Eusebius, a relatively large portion has been preserved.

Although posterity suspected him of Arianism, Eusebius had made himself indispensable by his method of authorship ; his comprehensive and careful excerpts from original sources saved his successors the painstaking labor of original research.

Hence, much has been preserved, quoted by Eusebius, which otherwise would have been destroyed.