On the meaning of "doctrina"

Translated simply, this quotation becomes:
"For what is a man, howsoever rich, howsoever powerful, without teaching?"
The author was a medieval Abbot in Bohemia. His usage of "doctrina"--"teaching" in classical Latin--undoubtedly had connotations. Encyclopedia Britannica (1995 online edition) offers the following discussion:
Doctrine in theology (Latin doctrina; Greek didaskalia, didache) is a generic term for the theoretical component of religious experience....Doctrines seek to provide religion with intellectual systems for guidance in the processes of instruction, discipline, propaganda, and controversy.

Dogma (Latin decretum, Greek dogma) has come to have a more specific reference to the distillate of doctrines: those first (basic or axiomatic) principles at the heart of doctrinal reflection, professed as essential by all the faithful.