 Hun and po souls, explains Yu (1987:371) , "are regarded as the very essence of the mind, the source of knowledge and intelligence.
<clarity>  Hun and po souls, explains Yu (1987:371) , "are regarded as the very essence of the mind, the source of knowledge and intelligence.
 Hun and po souls, explains Yü , "are regarded as the very essence of the mind, the source of knowledge and intelligence.