'According to the Flesh' in the Bible

What, then, shall we say that Abraham, our forefather, has found according to the flesh?

that the requirement of the law might be fulfilled in us, who walk not according to the flesh, but according to the Spirit.

For those who are according to the flesh do mind the things of the flesh; but those who are according to the Spirit, the things of the Spirit.

Accordingly, then, brethren, we are debtors, not to the flesh, to live according to the flesh;

for, if ye live according to the flesh, ye are going to die; but, if by the Spirit ye put to death the deeds of the body, ye shall live.