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.”

「血气」（﹕外貌；意思﹕肉体）﹕是词，指「知道」、「认识」人这词。们如何认识（或不认识）﹕「不肉体」。