Bhagavad Gita, Chapter 2, Verse 71

That man attains peace who lives free from longing, having given up all desire, without the sense of 'I' and 'mine.'

Less grasping, less claiming, less ego. What's left after that is actual peace.

Peace here isn't described as something added on top of a busy, acquisitive life. It shows up once the grip of wanting, owning, and self-importance genuinely loosens, not before.