Be and behave grown-up, not childishly. Understand something of yourself, your character, your strengths and weaknesses. Find and keep a balance, a common-sense, and a sanity. Value good health, good diet, good manners. Develop yourself, your talents, your knowledge, your calm.
-- Notebooks Category 2: Overview of Practicies Involved > Chapter 5: Balance the Psyche > # 154