Didaché vs. Didaskalia. The New Testament employs another word for "teaching" or "doctrine": didaskalia (διδασκαλία, G13
Of the doctrine of baptisms, and of laying on of hands, and of resurrection of the dead, and of eternal judgment.
Hebrews 6:2, KJV Here, "doctrine" translates didachēs , and the context lists essential, nonnegotiable first principles. These are not secondary matters but the elementary didaché upon which all further growth is built. This lexical picture reveals that the New Testament conceives of doctrine as a structured, coherent, and foundational body of truth.
Didaché vs. Didaskalia.
The New Testament employs another word for "teaching" or "doctrine": didaskalia (διδασκαλία, G1319). While the words are related and often overlap, a distinction in nuance exists that illuminates the nature of didaché . If didaché emphasizes the content of what is taught, didaskalia frequently emphasizes the act, the office, or the authoritative function of teaching. Didaché is the doctrine that established the church in the narrative of Jesus and the apostles. Didaskalia is the teaching activity that sustains and orders the church in the epistles. Didaché highlights the content or substance of what is taught - the message itself.
Didaskalia often emphasizes the activity, process, or authoritative function of teaching.
Didaskalia appears 21 times in the New Testament, overwhelmingly in the Pastoral Epistles — 1 Timothy, 2 Timothy, and Titus. Paul uses it when instructing pastors about their duties and when warning against falsehood.
For example, Titus is commanded to appoint elders who hold fast to the faithful word.
Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.