'According to the Flesh' in the Bible

This, therefore, counselling, did I then use the lightness; or the things that I counsel, according to the flesh do I counsel, that it may be with me Yes, yes, and No, no?

So that we henceforth have known no one according to the flesh, and even if we have known Christ according to the flesh, yet now we know him no more;

and I beseech you, that, being present, I may not have courage, with the confidence with which I reckon to be bold against certain reckoning us as walking according to the flesh;

for walking in the flesh, not according to the flesh do we war,

since many boast according to the flesh, I also will boast: