For the benefit of the readers of the Indian Opinion (South Africa), I wrote a few articles under the heading Guide to Health in or about the year 1906. These were later published in book form. I found that it was known to the Indian public, but copies were not available in India. The late Swami Akhandanand asked for my permission to publish an Indian edition. The enterprise proved very popular. The book was translated into several Indian languages. An English translation also appeared. This reached the West, and was translated into several European languages. The result was that the book became the most popular of all my writings. I have never been able to understand the reason for this popularity. I had written those articles casually, and I did not attach much importance to them. But perhaps the reason for the popularity is to be sought in the fact that I have looked upon the problem of health from a novel point of view, somewhat different from the orthodox methods adopted by doctors and vaidyas.
Whether my presumption is correct or not, many friends have been pressing me to publish a new edition, putting forth my views to date. I have never been able to revise the original. I have never had the time for it. The present enforced rest offers me such an opportunity and I am taking advantage of it. I have not even got the original with me. The experience of so many years cannot but have left its mark upon my thought. But those who have read the original book will notice that there is no fundamental difference between my ideas of today and those of 1906. But my mind is responsive. Therefore, whatever change the reader may find will, I hope, be in the nature of a progress.
I am giving a new name: Key to Health. Anyone who observes the rules of health mentioned in this book will find that he has got in it a real key to unlock the gates leading him to health. He will not need to knock at the doors of doctors or vaidyas from day to day.