Sadasiva never spoke a word or wore a cloth. One morning the nude yogi unceremoniously entered the tent of a Mohammedan chieftain. His ladies screamed in alarm; the warrior dealt a savage sword thrust at Sadasiva, whose arm was severed. The master departed unconcernedly. Overcome by remorse, the Mohammedan picked up the arm from the floor and followed Sadasiva. The yogi quietly inserted his arm into the bleeding stump. When the warrior humbly asked for some spiritual instruction, Sadasiva wrote with his finger on the sands: "Do not do what you want, and then you may do what you like." The Mohammedan was uplifted to an exalted state of mind and understood the paradoxical advice to be a guide to soul freedom through mastery of the ego.
- Autobiography of a Yogi
I actually find the bolded quote very meaningful in personal context, for me it's summed up to one important lesson; give up the wants of the ego for the fulfillment/freedom of the Self.