The mind becomes quiescent by regulation of breath,like a bird caught in a net. This is a means of mind control. —-Maharishi Ramana.
Comment; Yogis said that mind and breath come from the same source which is life source or self. so if we control the mind flow of breath is alos cotrolled and if we observe the flow of breath mind also controlled. Buddha gives Vippasana meaning observation of breath and mind simulaensly. In this process mind will able to slow down. So maharishi is telling us that by the observation of breath which is Vippasana mind will controlled. Because in stillness of mind we are able to understand bliss or eternal peace.