Der Niedergang der Koptischen Kirche

Motto:

To write rapidly about Egypt (and the Copts) is impossible. The
subject grows with the book, and with the knowledge one
acquires by the way. It is, moreover, a subject besat with such
obstacles as must impede even the swiftiest pen. Moreover, the
writer who seeks to be accurate, has frequently to go for his facts, if
not actually to original sources, at all events to translations and
commentaries locked up in costly folios, (rare prints), or dispersed far
and wide among the pages of scientific journals and the transactions
of learned societies. A date, a name, a passing reference, may cost
hours of seeking. 1