Mastery of self is a great virtue. Most people seek to exert dominance and control outside themselves. Control only leads to compliance. The opposite of control, which is autonomy, leads to engagement. And engaged people experience more Happiness.
Engagement comes from within. It intrinsically motivates us to get better at something that matters. To become a master is what intrinsically motivates human beings.
A Buddha Quote: "It is better to conquer yourself than to win a thousand battles. Then the victory is yours. It cannot be taken from you, by anyone or anything."
To become a master of self you have to understand your own Reality and you have to deeply understand that everyone on this planet has its own Reality. If you want to be happy and successful, that is your state of mind. If you want to feel pain, that is your state of mind. Both are just thoughts, nothing more. The choice is yours.
Only one who devotes himself to a cause with his whole strength and soul can be a true master. Mastery demands all of a person.
Zen Buddha is happy for the opportunity to share this tarot card with you. Show your Generosity towards your friends. Inspire them as well!