"Mastery of Self" is a self-help book written by Christian D. Larson. Originally published in 1922, Larson, an influential New Thought leader and author, shares insights and principles aimed at personal development and self-improvement.

The book explores themes related to mastering one's own mind and achieving success through positive thinking, self-discipline, and the cultivation of a constructive mindset. Larson draws on principles from New Thought philosophy, which emphasizes the power of thought in shaping one's life and experiences.

Key aspects of "Mastery of Self" include:

Positive Thinking: Larson encourages readers to cultivate a positive mental attitude and to focus on constructive thoughts. He argues that the mind has the power to shape one's reality.

Self-Discovery: The book delves into the idea of self-discovery, encouraging individuals to understand themselves better, recognize their strengths and weaknesses, and align their actions with their true potential.

Mind Mastery: Larson emphasizes the importance of mastering one's own mind, controlling thoughts, and maintaining mental discipline to achieve personal goals.

The Power of Will: The book explores the role of willpower in achieving success and overcoming challenges. Larson advocates for the development of a strong and persistent will.

Personal Transformation: Larson believes in the possibility of personal transformation through conscious effort and the development of positive habits.

"Mastery of Self" is reflective of the self-help literature of the early 20th century, which often combined psychological insights with spiritual and metaphysical principles. While some concepts may be rooted in the philosophical and psychological ideas of its time, readers interested in the New Thought movement and self-help literature may find value in Larson's perspectives on personal development and self-mastery.