《管子·内业》
气，通达开来就产生生命，有生命就有思想，有了思想就有知识，有知识就应及时停止了。
气，道乃生，生乃思，思乃知，知乃止矣。
Qi, once opened up will produce life, with life there will be thought, with thought there will be knowledge, with knowledge there should be timely stop.