Watching the flow of breath with the mind is restraint of it. Such watching, if constant steadies the breath.—-Maharishi Ramana.
Comments; As I studied literature of Vadanta and learned from holy saints, our breath and mind comes from the source of life. If we slow down one another has also started to slow down. As our car if running fast we have to slow the speed for using breaks. Likewise, our mind runs after the worldly objects so we use these methods to slow down.So maharishi is giving his instructions that watching the flow of breath with the mind is restraint of it.Such watching if constant steadies the breath and the mind also becomes cool. For the experience of bliss mind should be stilled, there are so many methods like as Nam Japa, observation of mind and breath which is Vippassana.