Rabindranath Tagore 
Sadhana, The Realisation of Life [EPUB ebook] 

Compiled and translated by Tagore from his Bengali lectures, the book consists of eight essays, in which he answers some of the most profound questions of life: Why did God create this world? Why would a Perfect Being, instead of remaining eternally concentrated in Himself, go through the trouble of manifesting the Universe? Why does evil exist? Do love and beauty have a purpose?