“道可道也非恒道也名可名也非恒名也......” “无名万物之始也有名万物之母也......” “玄之又玄众妙之门......” “始内有终则终不成终......终内有始......” “重迟不可站...饥馑不可以动,神气去而万里......” “虚者,有无皆忘,万异冥一,故为之虚