Each person must master these Daoist arts on his or her own, taking into account one's idiosyncrasies. The emphasis is on the individual. According to Ko Ching-ming, professor of Chinese at National Taiwan University, "The focus of the search for immortality is not on the unchanging nature of the universe, but the ability of the individual to remain unchanged."
因此道教的修煉是以個人為單位去思考個人差異，強調的是個體性，「要肯定的不是宇宙永恆，而是個體生命的歷劫不變」，台大中文系教授柯慶明解釋「仙」的特質。