Strength

As a young lawyer and student of Hindu philosophy, Gandhi was all too aware of the social injustice that the British held over the disparate groups of people in India. Over the course of years, he would develop and write about his beliefs in 'Satyagraha'(non-violent resistance). He becomes such an example of these techniques that it led to his becoming the father of the Indian Independence Movement which eventually unified the nation through peaceful civil disobedience and ended the tyranny of British rule in India.
Strength is not always about physical prowess, more often than not it is about character. Being a person of character means holding true to your beliefs and acting for the common good.