From the book: As a Man Thinketh
Calmness of mind is a jewel of wisdom. It is the result of long and patient effort in self-control. Its
presence is an indication of ripened experience, and of a more than ordinary knowledge of the laws, operations, and effects of thought.
An individual becomes calm in the measure that they understands themselves as a thought evolved being, such knowledge necessitates the understanding of others being who they are as the result of their own thoughts. As right understanding develops the individual sees more and more clearly the internal relations of things, by the action of cause and effect and so ceases to fuss and fume and worry and grieve, and remains poised, steadfast, serene.