This great work of Swami Sivananda contains a masterly exposition of the principles and methods of the life-saving spiritual science. Aptly it has been named as "DIVINE NECTAR' as the aspirant, once tasting a drop of it, will not rest content until he gulps the whole lot. Swamiji's writings are not pedantic boredoms, but a sweet music of depth and beauty thrilling it's readers and transforming them unawares. The popularity of the book is such that it has run into four reprints.