This is chapter 7 Serenity from AS A Man Thinketh by James Allen. First published in 1903, As a Man Thinketh was described by James Allen as "a book that will help you to help yourself", "a pocket companion for thoughtful people".

This little volume, the result of meditation and experience, is not intended as an exhaustive treatise on the much written upon subject of the power of thought. It is suggestive rather than explanatory, its object being to stimulate men and women to the discovery and perception of the truth that they themselves are makers of themselves by virtue of the thoughts, which they choose and encourage; that mind is the master-weaver, both of the inner garment of character and the outer garment of circumstance, and that, as they may have hitherto woven in ignorance and pain they may now weave in enlightenment and happiness. - From as a man thinketh James Allen.

An excerpt from "As a Man Thinketh" chapter 7 "Serenity" by James Allen -
That exquisite poise of character which we call serenity is the last lesson of culture; it is the flowering of life, the fruitage of the soul.

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