I've had this book laying on the shelf for a long 2 years and I regret it.
It opened my eyes on the next things:
-setting priorities right;
-what defines leader insight out and how important to support positive successful thinking;
-change of the attitude towards “what I can“ and “what I can't“, and many more.
In general, it gives everything needed to get responsibility for life and start developing a better version of it.