The present revised edition of Karma-yoga and Bhakti-Yoga has been taken from Vivekananda: The Yogas and Other Works, published in 1953 by the Ramakrishna-Vivekananda Center of New York. The following lines quoted from my preface to the latter will explain the reasons for the editing of the book:"Swami Vivekananda's public life covered a period of ten years-from 1893, when he appeared at the Parliament of Religions held in Chicago, to 1902, when he gave up his mortal body. These were years of great physical and mental strain as a result of extensive travels, adaptation to new environments, opposition from detractors both in his native land and abroad, incessant public lectures and private instruction, a heavy correspondence, and the organizing of the Ramakrishna Order in India. Hard work and ascetic practices undermined his health. The Swami thus had no time to revise his books, which either were dictated by him or consisted of lectures delivered without notes and taken down in shorthand or longhand… I have therefore felt the need of editing the present collection, making changes wherever they were absolutely necessary, but being always mindful to keep intact the Swami's basic thought." Ninety pages of new material from the lectures of Swami Vivekananda have been added to the present volume in order to give the reader access to more of the Swami's teachings and also to make the present volume uniform with the other three books of the series.