I found this book in the book heap and thought to read it. One can clearly see how old it is. It is a 1972 publication. It belonged to a senior friend of my father. He left all his books at our house for safe keeping. He died a few years back. No one came to collect the books, So I took what I wanted from it. The rest will go to some old book store.
Its a really good one. Not fiction. I don’t know whether everyone will like it. It is kind of philosophical. Sadhana means (according to answers.com)
A key form of tantric meditation through which a practitioner aims to achieve union or identity with a particular divine being through a process of visualization and subsequent dissolution of subject and object into emptiness (śūnyatā).
It has food for thought as they say. It makes one realize that hardships and pain of life is but for a small time. One must always look at the big picture of life as a whole and not at the portions of it which brings us pain.
It has 8 chapters each one deals with things like
I. The Relation of the Individual to the Universe
II: Soul Consciousness
III: The Problem of Evil
IV: The Problem of Self
V: Realisation in Love
VI: Realisation in Action
VII: The Realisation of Beauty
VIII: The Realisation of the Infinite
It can also be read online it seems here is a link ->http://www.sacred-texts.com/hin/tagore/sadh/index.htm