Breathe deeply and fill your beings with Prana
If you become capable of relaxing the body voluntarily, then you will be able to help your mind relax voluntarily. The whole art and science of meditation is to expand our consciousness to become one with the cosmic consciousness, The Brahma. It is precisely for this reason that that the seekers used to go away from the confines of home to the vast expanse of the Himalayas, to the banks of Gangas.