For Gandhi, truth was the sovereign principle; inclusive of many other spiritual principles and schools of thought.
"[I]t is not my purpose to attempt a real autobiography. I simply want to tell the story of my numerous experiments with truth, and as my life consists of nothing but those experiments, it is true that the story will take the shape of an autobiography...", he adds in the introduction. And hence the title My Experiments with Truth. However, he further notes that "... [the experiments] will of course include experiments with non-violence, celibacy and other principles of conduct believed to be distinct from truth."
In this autobiography, Gandhi has recounted the period from his birth (1869) up to the year 1921. In the last chapter, he notes, "My life from this point onward has been so public that there is hardly anything about it that people do not know..."
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The only English translation of The Story of My Experiments with Truth was done by Gandhi's friend and assistant Mahadev Desai. By modern standards Desai's translation is flowery and liberal, turning passages such as "Everyone should fast and stop work" into "Let all the people of India, therefore, suspend their business on that day and observe the day as one of fasting and prayer." It also bowdlerises the original in places.
I don't know why people insist on believing this garbage. Gandhi was not a saint, not even spiritual but just a small, cruel man.... about as "spiritual" as Jimmy Carter.