The cardinal difference between the two rests on their theistic and atheistic belief, but as already stated. It makes no difference in their systems. Isolation of soul from thinking principle is the end sought in either case, and meditation in Samadhi is the only means available. The believer in the existence of the God head assumes that divine grace facilitates the end sought, but he does not dispense with Samadhi, and his belief, therefore, is of no material importance.