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；思﹕凭肉体）﹕是词，指「知道」、「认」动词。他们如何认（或不认）﹕「不凭肉体」。