The Rubaiyat of Omar Khayyam explained

Paramhansa Yogananda One of the best-known spiritual teachers of the 20th century, his Autobiography of a Yogi, published in 1946 and printed in more than 20 languages, has touched the hearts of millions and remains the best-selling spiriitual autobiography of all time. Yogananda was the first Indian yoga master to make his home in the West. He lived in America from 1920 until his death in 1952. Today hundreds of thousands of seekers around the world practice the meditation techniques he brought from India and consider themselves his spiritual disciples.