Inner engineering by Sadhguru is an amazing read for a yogi and a person who is pursuing his path towards yoga or just want to know the real nature of life.
This book doesn’t belong to any religion, but after reading it you will look life the way it is.
It contains some short stories which will inspire you towards yoga and mysticism.
I suggest you to read this book once if you want to know the nature of your existence. This book might be a life changing experience for you.