Nearly four decades ago, an intense series of spiritual visions led one of India's top nuclear physicists, until then a religious skeptic and man of science, to walk away from his prestigious post at the heart of the country's missile-defense complex. Retreating into the remote jungles of eastern India, he discovered the remains of a centuries-old Tantric Mother Goddess shrine and embarked on a life-altering quest to revive and expand it – eventually attracting tens of thousands of followers from across India and around the globe. Part biography and part spiritual guidebook, this book chronicles the astonishing, inspiring – and yet deeply human – life of Dr. Nishtala Prahlada Sastry (later best known as Sri Amritananda Natha Saraswati, or simply "Guruji"); his triumphs and disappointments, public successes, and personal crises. In addition to Amritananda's life story, the book also offers a generous selection from his writings, lectures, ritual guides and poetry – a treasure trove for those who wish to significantly deepen their spiritual practice while remaining fully engaged with the world.