Christian Education is the permanent challenge to the work of the Church. Jesus gave us the perfect example in his word by teaching and commanding us to spread the Gospel. Sunday School is instrumental in preparing us to share the Word and Works of Jesus.
Jesus was going throughout all Galilee, teaching in their synagogues and proclaiming the Gospel of the Kingdom, and healing every kind of disease and every kind of sickness among the people (Matthew 4:23)
And He gave some as apostles, and some as prophets, and some as evangelists, and some as pastors and teachers, 12 for the equipping of the saints for the work of service, to the building up of the body of Christ; 13 until we all attain to the unity of the faith, and of the knowledge of the Son of God, to a mature man, to the measure of the stature which belongs to the fullness of Christ (Ephesians 4:11-13)
Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit, 20 teaching them to observe all that I commanded you; and lo, I am with you [b]always, even to the end of the age (Matthew 28:19-20)