The book The Hegemon of Mind, Behavior, and Action by Emmanuel Osei Nyarko Gyimah (Philos Aeternus) is a guide to self-mastery. It teaches that you are the "Hegemon"—the ruler or CEO of your own life. 
The core message is: "To think is to become, and to become is to think". 
The 3-Step Process of Self-Mastery
The book breaks down human nature into a simple flow:
1. The Mind: Everything starts with a thought. Your mind is the "CEO" that processes information and creates beliefs. 
2. Behavior: What you think internally turns into how you act externally. Over time, these actions become automatic habits. 
3. Action & Conduct: Your repeated behaviors form your "conduct"—the consistent pattern of who you are and what you stand for. 
Main Takeaway
To change your life, you must first change your mind. By practicing awareness and emotional intelligence, you can stop reacting blindly to the world and start making conscious, ethical decisions that align with your true values.