'Of the Flesh' in the Bible

and ye have known that through infirmity of the flesh I did proclaim good news to you at the first,

And I say: In the Spirit walk ye, and the desire of the flesh ye may not complete;

And manifest also are the works of the flesh, which are: Adultery, whoredom, uncleanness, lasciviousness,

because he who is sowing to his own flesh, of the flesh shall reap corruption; and he who is sowing to the Spirit, of the Spirit shall reap life age-during;