A Great Guru once said that the difference between an enlightened being and someone who still has the ego and mind in control, is that when the average person gets mad, they stay mad for 3 weeks, the SELF Realized one gets mad for 3 minutes.
This is personal mastery. When you can control your mind and your thoughts, you control your emotions and you control your life. You have mastery over your experience on earth.
You control the vibration you "broadcast". Thus you control what you "attract" in your life.