“雪僧”先生引陈撄宁先生《读(化生自叙)的感想》说:“古仙大半是从外丹入手,完全是物质方面事,对于虚空,不起交涉,对于肉体,亦无所作为。后代修炼家,畏外丹之繁难,喜内炼之简易,改由肉体精气神下手,遂有炼精化气、炼气化神、炼神还虚之说。后又以为不足,再加上炼虚合道一层。于是乎,丹道与虚空遂发生关系……同时复觉执着虚空,亦非玄妙,遂用打破虚空,粉碎虚空之说,以调剂 “Snow Monk” quoted Mr. Chen Suining’s “Reading (Metaphysics) Feeling” said: "Most of the ancient immortals are starting from the Dan, is completely material things, for the void, can not afford to negotiate, for the body, nothing. Practitioners, Dan fear of foreign Dan difficult, Si domestic refining simple, change the spirit of the flesh to start, then there refining refining gas, gasification of God, refining God also said nothing. Later thought inadequate, plus Refining the convergence Road layer .Therefore, Dan Road and the void Then the relationship ...... At the same time revisit persistent empty, nor mysterious, then use to break the void, smashing the void that in order to swap