The foundation of this work is a fine character. He who is without such moral development will be without personal control of the powers of the mind when they appear as a result of this training; instead those powers will be under the control of his ego. Sooner or later he will injure himself or harm others. The philosophic discipline acts as a safeguard against these dangers.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1: Uplift Character > # 9