Catholic Answers Senior Apologist Jimmy Akin explains the reasons why Origen is classified as an Ecclesiastical Writer rather than a Church Father.
Jimmy Akin was born in Texas and grew up nominally Protestant. At age 20 he experienced a profound conversion to Christ. Planning on becoming a Protestant pastor or seminary professor, Jimmy started an intensive study of the Bible, but the more he immersed himself in Scripture, the more he found...
"We rightly praise the Slavonic letters invented by Cyril, in which praises to God are set forth."
~ Pope John VIII, an excerpt from his sanction of the use of the Slavonic language in the Mass and other church offices, noting the invention by St. Cyril of a special alphabet which now bears his name (Cyrillic); part of the church's civilizing work among the pagan Slavs