'According to the Flesh' in the Bible

When, therefore, I was purposing this, did I manifest fickleness or the things which I purpose, do I purpose according to the flesh, that with me there should be the "Yea, yea," and the "Nay, nay?"

Wherefore, we henceforth know no one according to the flesh; even if we have known Christ according to the flesh, yet now no longer do we know Him thus.

but I pray that, when present, I may not show courage with the confidence with which I purpose to be bold against some who reckon us as walking according to the flesh.

For, though walking in flesh, we are not warring according to the flesh,

Since many glory according to the flesh, I also will glory;