Regarding your question:

<< ... how do I discern the desire of the inner man that wishes to do good from the religious flesh that wishes to justify itself? >>

I would agree with your questioning whether you even have to. I say this, not because they are similar, but because they have nothing in common. Because something happens when we start examining them: since the NEED to examine is based on the relativity of comparison, that logic forces the life of God into the same rules as that which is of the world. All we end up with are counterfeits of the original miraculous work of God that took place within us.