'Of the Flesh' in the Bible

Ye know well how that through infirmity of the flesh, I preached the gospel unto you at the first.

I say, walk in the spirit, and fulfil not the lusts of the flesh.

The deeds of the flesh are manifest, which are these: adultery, fornication, uncleanness, wantonness,

He that soweth in his flesh, shall of the flesh reap corruption: but he that soweth in the spirit shall, of the spirit, reap life everlasting.