The imparting, or preaching, to another of information, experience or skill. Enlightened souls are concerned with correct teaching, for there is so much wrong teaching that delays other souls from reaching the light.
As an example, false teaching places many souls to be trapped in cemeteries waiting with their bodies for the Judgment Day. Nothing can be done for them until they learn to change their thoughts. If they knew that they were waiting, that would destroy the thought-form. In addition, time has no meaning, while they are waiting, because in the world of spirit, there is no Earth spinning on its axis.