The Great "Deposit"

Paul had a plan to establish the Churches in sound doctrine (didache). He understood that his message was not derived from his own mind niether had sprung-up from the culture. Paul had received a body of instruction from the Lord as noted in 1 Thessalonians 4:2, “For you know what instructions we gave you through the Lord Jesus.” Paul and the apostles, were entrusted with a deposit, a body of teaching, handed down from Jesus Christ (Eph. 3:5; 1 Tim. 6:20; 2 Timothy 1:14). They were called to establish the Churches in this deposit, this great apostolic core. They were to preach and teach, bear upon minds, remind, refresh, recall, establish, equip, ground, solidify, build-up, entrust, investigate, build on, expound, reflect on, reason with, develop, illustrate, apply, recollected, to literally deposit the “good deposit” to others, and thus bring the Church to a deeper insight (Eph. 1:17-19). This good deposit is necessary to build mature believers..
“The Teaching” was grounded in the redemptive facts of the Gospel (1 Cor. 15:1). In a comprehensive sense, this body of teaching is about the “things concerning Jesus” (Acts 18:25; 28:31), and “the teaching” contains the entire content of the gospel (Gal. 1:12; Eph. 4:21). This body of teaching is found in the activities of the apostles (Acts 11:26; Col. 1:28) as “the teaching of the apostles” (Acts 2:42; Rom. 6:17), “the teaching of God, our Savior” (Titus 2:10), “the good teaching” (1 Tim. 4:6), “the sound teaching” (1 Tim. 1:10; 2 Tim. 4:3; Titus 1:9).*
Paul also desired to establish the Churches because of dangers to the Churches. They were to be grounded in “sound doctrine,” like a billion pound anchor at Sea, so that they wouldn’t be tossed back and forth by every wind of false doctrine (Eph. 4:14), rebuke those who contradict “sound doctrine” (Titus 1:9), and were called to watch out for those who create obstacles contrary to the doctrine that they had been taught (Rom. 16:7). Paul encouraged Timothy to warn those who teach different doctrine than what Paul had given (1 Tim. 1:3) and who practice a sensual lifestyle contrary to sound doctrine (1 Tim. 1:10).
Positively, Paul wanted good doctrine to be placed before all the Christians in the Churches (1 Tim. 4:6). They were to hold firm to the trustworthy word “as taught” (Titus 1:9), adorn the doctrine of God our Savior (Titus 2:10), and teach what accords with sound doctrine (Titus 2:1). Paul wants the Churches to have deep bedrock slab to build upon.
The “teaching” was meant to widen the eyes of faith and see God as revealed in the person of Christ, sink the people with Word of Truth tent-stakes, build-up God’s people, and keep them from the ever-lurking dangers that seek to supplant the oak planks with quick sand.