Side line: “kata sarka” (according to the flesh) must be taken as adverbial, it qualifies verbs for “knowing” – how they know or in this sense not knowing – “not according to the flesh.”

「凭血气」（中译﹕凭外貌；意思﹕凭）﹕词，「道」、「认识」人这动词。他们如何认识（或不认识）﹕「不凭」。