Security of earthly possessions is hard to find and harder to keep in the quick-changing world of today. So anxieties and worries get multiplied. Because of this, inner security, the close friend of inner peace, becomes proportionately more valuable. If it is to be attained, the first practical requirement is to train oneself in the art of keeping emotionally and mentally calm.
-- Notebooks Category 6: Emotions and Ethics > Chapter 3: Discipline Emotions > # 79