No one branch of study should receive special attention to the neglect of others equally important. Some teachers devote much time to a favorite branch, drilling students upon every point, and praising them for their progress, while in other essential studies these students may be deficient. Such instructors are doing their pupils a great wrong. They are depriving them of that harmonious development of the mental powers which they should have, as well as of knowledge which they sorely need. CT 232.1
In these matters, teachers are too often controlled by ambitious and selfish motives. While they labor with no higher object, they cannot inspire their pupils with noble desires or purposes. The keen, active minds of the youth are quick to detect every defect of character, and they will copy defects far more readily than they will the graces of the Holy Spirit. CT 232.2