Sat Nam is a Mantra, or "seed sound". Sat means Truth, the ultimate, unchanging, Universal ruth. NAM means name or identity. When we say SAT Nam to each other, we are acknowledging our mutual divine identity. And, at least for that brief moment, we are united, one in spirit. There are no barriers, no walls of fear, or separation between us. By using Sat Nam as a greeting.
Expand your mind is calm, meditative, and under your control, your rate of breathing will be slow, steady, and calm. So, it is logical that by breathing slowly and steadily you will calm your mind,. Yes, to repeat, it's a fact: You change your rate of breathing, and you change your state of mind. To breathe more slowly, it is necessary to have a larger lung capacity. One of the first things we work on is increasing lung capacity. The fastest way to achieve that is by practicing Breath of Fire.