Indoctrination is talk that closes the mind. Indoctrinators speak with unquestioned certainty and unshakable conviction. They believe they possess the truth. They transmit a formula for faith, a uniform way of viewing the world, and a standard form of speech and expression to their pupils. Questioning the formula is not permitted, perceiving different points of view is not tolerated, and deviating from the standard form of speech and expression is not welcome.
This form of speech reduces trust to the small group of the indoctrinated. Suspicion of others can be so intense that adherents often feel threatened by any friendly and open conversation with those who do not accept their doctrine.
Indoctrination is the Sanhedrin commanding Peter and John "not to speak or teach at all in the name of Jesus."" (Acts 4:1-22)