Buddhism holds that the cause of our cyclic existence is nothing physical but karmic force. As long as karmic forces remain, physical body will continue to manifest no matter how many times it has perished. Once the habitual tendency accumulated in the alaya consciousness has reached a maturing point, physical body may manifest at any given time. It can also be said that the physical world, the universe and the body of sentient beings are the work of alaya consciousness, not unlike what the materialists suggest that mental phenomena are something manufactured by the brain. The fact is that it would be totally useless to torture the body to attain enlightenment so long as karmic forces remain in the alaya consciousness. That is why the Buddha asked the followers not to live in hardship deliberately because it will not bring anyone any closer to liberation, only suffering upon oneself. 

- Quote from The Right View, "A Buddhist’s Mode of Life"