The habits and principles of the teacher should be considered of even greater importance than his literary qualifications. If he is a sincere Christian, he will feel the necessity of having an equal interest in the physical, mental, moral, and spiritual education of his pupils. In order to exert the right influence, he should have perfect control over himself, and his own heart should be richly imbued with love for his pupils, which will be seen in his looks, words, and acts. He should have firmness of character, and then he can mold the minds of his pupils, as well as instruct them in the sciences. CT 77.1
The early education of the youth generally shapes their characters for life. Those who deal with the young should be very careful to call out the qualities of the mind, that they may better know how to direct its powers so that they may be exercised to the very best account. CT 77.2