What is the mind of the flesh?

It has one chief characteristic: believing in oneself as all-knowing and all capable.

They endeavor to reform their old state, and to be made perfect in the flesh, instead of putting it off and walking according to the New State in Christ.

They trust on low carnal things for Holiness, and upon the acts of their own will, their purposes, resolution, and endeavors, instead of Christ, and they trust to Christ to help them in this carnal way,

Whereas True Faith would Teach them that they are nothing, and that they do but labor in vain.