Great Bible Teachers Bear This Responsibility

From Steve Parr's excellent book, Sunday School That Really Works: A Strategy for Connecting Congregations and Communities (emphasis mine) : 

"Lives will be changed. God's Word is powerful, and people are transformed as they are exposed to it. The problem that many Sunday school classes encounter is not the power of God's Word but the anemic presentation of unprepared or passionless teachers. The teachers I am describing love God and love their church. However, they may not have been equipped and are often not motivated to prepare and present the lesson with effectiveness. It certainly cannot help their attitude if the pastor or other leaders are talking down the value of Sunday school. Additionally, many are unaware that they are ineffective. They have concluded that the purpose of Sunday school is to study the Bible, and that is what they are doing. Therefore, they see themselves as successful. James 1:22 says, "But be doers of the word, and not hearers only, deceiving yourselves:" A Bible study in a Sunday school class or a small group of any kind is not intended to be an academic exercise. It is intended to be an encounter with God that affects the participants' lives day in and day out. An encounter with God's Word should lead to personal spiritual growth that in turn leads to life change. The teacher of the class bears the responsibility of confronting the class members with the truth of God's Word with the aim of personal application"