'Of the Flesh' in the Bible

You know that through weakness of the flesh I preached the gospel to you at the first:

I say this: Walk in the Spirit, and you will not fulfill the desires of the flesh.

For the desire of the flesh is against the Spirit, and the desire of the Spirit is against flesh; and these are opposed, the one to the other, so that you can not do what you would.

Now the works of the flesh are well known, and they are these lewdness, uncleanness, wantonness,