His Catena Aurea next appeared, which, under the form of a commentary on the Gospels, was really an exhaustive summary of the theological teaching of the greatest of the church fathers.
A catena of opinions may be produced in favour of almost any theory; but formularies express the collective or average belief of any given period, and changes in them are a sure indication that there has been a general change in ideas.
They are amongst the earliest examples of the "catenic" (catena, chain) form of commentary, consisting of a series of extracts from the fathers, arranged, with independent additions, to elucidate the portions of Scripture concerned.
Elias of Merv, who belongs to the 2nd half of the 7th century, compiled a Catena patrum on the Gospels and wrote many commentaries.
Catena, a chain), in mathematics, the curve assumed by a uniform chain or string hanging freely between two supports.