A well-developed critical intellect in combination with over-concentration produces an exceptionally strong ego. Such a person should cultivate a little more humility so as to improve the natural balance of his personality. He must humble the ego. He should do this himself, secretly, and through calm, reflective meditation; then life will not do it to him openly and through bitter external circumstances.
-- Notebooks Category 2: Overview of Practicies Involved > Chapter 5: Balance the Psyche > # 191