'According to the Flesh' in the Bible

Therefore, I was not vacillating when I intended to do this, was I? Or what I purpose, do I purpose according to the flesh, so that with me there will be yes, yes and no, no at the same time?

Therefore from now on we recognize no one according to the flesh; even though we have known Christ according to the flesh, yet now we know Him in this way no longer.

I ask that when I am present I need not be bold with the confidence with which I propose to be courageous against some, who regard us as if we walked according to the flesh.

For though we walk in the flesh, we do not war according to the flesh,

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