Yogis, faqirs, Sufis may be seen sitting, standing in one posture for hours together. All the postures adopted are to control and govern every atom of the body, so that it may be under the control of the will. I do not mean that one should devote all one's time to these things, or even that one should have certain exercises for this. When one understands the matter, and carries it out in one's everyday life, then one's life becomes a continual progress.