Mystery
“The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science.”
― Albert Einstein
Autobiography of a Yogi by Paramahansa Yogananda
On the above link you can download Autobiography of a Yogi in various formats made available by gutemberg.org
Autobiography of a Yogi introduces the reader to the life of Paramahansa Yogananda and his encounters with spiritual figures of both the East and West. The book begins with his childhood family life, to finding his guru, to becoming a monk and establishing his teachings of Kriya Yoga meditation.
read more https://en.wikipedia.org/wiki/Autobiography_of_a_Yogi