Your nature as the Atman is peace according to Mandukya Karika. The moment we react to a little drop of pleasure in the world and we want that I wanted, we lost the natural peace. When he talks about Jitath Manaha it means one who has controlled the body, mind and senses. So steadiness. This is something I have seen in many spiritual seekers, especially the advanced spiritual seekers,. both monks and lay persons. Even physically also. That is why Swami Vivekananda specially and other monks also, they insisted on health.
Swami Sarvapriyananda teaches Chapter 6 (Verse 7) 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).