They think that all this is produced from and absorbed into the unmanifest. He who, even for the short space of time covered by a single breath, when his end comes, becomes equable, attaining to the self, fits himself for immortality. Controlling the self in the self, even for the space of a wink, one goes, through the tranquility of the self, to that which forms the endless acquisition of those that are endued with knowledge. Restraining the vital airs again and again by controlling them according to the method called Pranayama (suppression of vital airs), by the ten or the twelve, he attains to that which is beyond the four and twenty.