ceased to be so when those heresies stopped short in their movement and also petrified into the fixed forms of a church.

And, indeed what is a heresy? Read all the theological works one after another. In all of them heresy is the subject which first presents itself for definition; since every theological work deals with the true doctrine of Christ as distinguished from the erroneous doctrines which surround it, that is, heresies. Yet you will not find anywhere anything like a definition of heresy.

The treatment of this subject by the learned historian of Christianity, E. de Pressens�, in his “Histoire du Dogme” (Paris, 1869), under the heading “Ubi Christus, ibi Ecclesia,” may serve as an illustration of the complete absence of anything like a definition of