What is the theme in An Autobiography: The Story of My Experiments with Truth by Mahatma Gandhi?

As Ganhi's title suggests, truth is very much a theme in his autobiography. Truth and the search for truth is the compelling motivation in Gandhi's life. To Gandhi, God is truth. Everything he does is based on truth. In his law practice, he won't allow any misrepresentation of facts. Clients have seen him withdraw from their case in court if he finds any misrepresentation. His life is based on the search for truth which is the purpose of all of his experiments. His vow to his mother not to touch women, wine or meat wihle in England is an example of this.