A monk in india told him that strength is the ability to pull along with contradictions, multiple contradictions in life. He said you can't get angry and revengeful and furious, because these people are going to stab me in the back now. That is a sign of strength. It requires control over your mind. And it is spiritual freedom, freedom from the vicissitudes of one's own mind.
Swami Sarvapriyananda teaches Chapter 6 (Verses 33-35) of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).