Your intention is laudable, but I also believe a greater harvest can be reaped when one is mindful of the pride of those one hopes to improve. People rarely respond well when instruction feels like humiliation. In such moments, resistance is often less about the value of the knowledge and more about the discomfort of feeling inadequate, exposed or left behind. Even truth, when delivered without patience or sensitivity, can harden the very hearts it seeks to change.
The biblical image of new wine and old wineskins captures this well. New wine cannot simply be poured into old wineskins, because the old skins will burst under the pressure. Likewise, new ideas or new disciplines cannot always be forced abruptly upon people whose minds and habits have long been fixed in another way. Before the new wine can be received, the vessel itself must first be made ready.
Thus, if 'the teacher' desires a greater harvest, he must cultivate receptivity before demanding change. Patience, tact, and humility are not compromises of truth; they are often the very conditions in which truth can be received.