People who become impulsive, or show irritability in nature, who become impatient at times, who get fits of anger, passion, or laughter, who get spells of tears, all have an irregularity of breathing as the cause of all this. The physician has no remedy for their ills, modern psychology has not found the link, but the mystics of old have for years believed it -- not only believed it, but practiced it -- and have found in the end that balance of mind entirely depends upon regularity of breathing.