I mean untouchable in terms of personal integrity, not a reference to the caste system.
It is truly an extraordinary story, how a man went from being an English lawyer to the de facto leader of a non-violent revolution. It was his mother who would fast if things displeased her, and his English law degree helped him understand what would push the English out. But it is the moment when Gandhi was shoved off the train and fought back that I think is his most courageous moment. He was no one. To start a mad group willing to burn their registration papers, and to allow himself to be beaten senseless in trying to do so, without fighting back.
All the rest is history, but it is his time as a nobody fighting an impossible fight and winning that really inspires me.