'According to the Flesh' in the Bible

So then, was I indecisive or capricious when I was [originally] planning this? Or the things I plan, do I plan in a self-serving way like a worldly man, ready to say, “Yes, yes” and “No, no” [at the same time]?

I ask that when I do come I will not be driven to the boldness that I intend to show toward those few who regard us as if we walked according to the flesh [like men without the Spirit].

For though we walk in the flesh [as mortal men], we are not carrying on our [spiritual] warfare according to the flesh and using the weapons of man.

Since many boast [of worldly things and brag] about human accomplishments, I will boast too.