'According to the Flesh' in the Bible

When I therefore was thus minded, did I use lightness? or the things that I purpose, do I purpose according to the flesh, that with me there should be yea yea, and nay nay?

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;

But I beseech you, that I may not be bold when I am present with that confidence, wherewith I think to be bold against some, which think of 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 also will boast: