The Greek noun didaskalia (διδασκαλία) refers to teaching, doctrine, or the body of instruction — both the act of teaching and the content taught. It appears 21 times in the New Testament, concentrated especially in the Pastoral Epistles (1 and 2 Timothy, Titus), where 'sound doctrine (didaskalia)' is one of the defining markers of a healthy church and faithful ministry. The word comes from didaskō (to teach) and didaskalos (teacher).
Didaskalia is the backbone of Pauline ecclesiology in the Pastorals. The church is built on 'sound didaskalia' (1 Timothy 1:10; Titus 1:9; 2:1), and false teachers are identified by their contrary didaskalia (1 Timothy 4:1). The word distinguishes Christianity from mere religious feeling or mystical experience — the faith has content, substance, and specific teachings that can be held, taught, passed on, and defended. 2 Timothy 3:16–17 declares all Scripture 'profitable for didaskalia,' grounding Christian teaching in the God-breathed text. The goal of sound didaskalia is not intellectual mastery but moral transformation: Titus 2:1 connects sound doctrine to godly living in every season of life.