'According to the Flesh' in the Bible

Therefore I resolved this, much less did I use levity: or what I resolve, do I resolve according to the flesh, that there be with me yea, yea, and nay, nay

So that we from now know none according to the flesh: and if also we have known Christ according to the:flesh, but now we know no more.

And I pray, being present, not to be bold with the confidence which I reckon to encounter against certain, reckoning us as walking about according to the flesh.

Since many boast according to the flesh, I shall also boast.