Studying different views on the problem, the author tries to answer a complex philosophical and at the same time completely practical question: is it possible to change one's character or is it a given that subjugates a person, shaping his destiny and life attitudes, regardless of the efforts of the individual himself. The publication is devoted to the consideration of various aspects of working on oneself and one's character, based on the specified type of character. Each line of narration - from a religious approach to the topic to evidence-based practices - is accompanied by the author's comments and assessments. The book is intended for a wide range of readers.