Concerning Vivekananda’s classic commentary on Raja Yoga, in Russia Leo Tolstoy (1828-1910) the world famous writer noted, “The book is most remarkable and I have received much instruction from it. The metaphysical side of the doctrine, the precept as to what the true ‘I’ of man is, is excellent. So far humanity has frequently gone backwards from the true and lofty and clear conception of the principle of life, but never surpassed it.”