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How to make your inner self strong and your spirit strong. Today, let's learn about the thinking habits of people who have strong spirits because they are strong inside. How to grow into a person with a strong inner self. Reference books [Kim Mi-kyung's Forty Class], Kim Mi-kyung, Awake Books, 2023 [Glass Mentality, but Never Breaking], Kimura Konomi, Million Books, 2023 [I Chose Humanities Instead of Anxiety], Lee Yun-young, Philosophy of Trees, 2023 [What You Can Only Gain by Being Alone], Uenishi Akira, Forest Books, 2020 *** Your precious 'Subscriptions' and 'Likes' are a great help to me. Thank you. Self Company