Soul and Spirit - What's the Difference

This information is from a discussion I had online. It needs to be refined and scripture added for reference. These are just raw thoughts and the article will be updated as I have time.
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Sometimes they are used interchangeably in scripture. However, I believe that the soul refers more to the concept of individuality, the sense of self. It is our soul that we see in Hades when we die, our soul that is lost or saved. The soul represents the PERSON. The spirit represents the mind, the thinking, the life of the individual. The spirit is such that it can be united with other spirits even to the point of being united with God. The spirits of the Father, Son, and Holy Spirit are so united so as to be one being. We are to have the same mind and the same spirit towards one another. This means that our thinking, our way of living, our hearts and minds are as one. Spirit is breath, it is causal force, will to act. Thus, we are told to have the spirit of Christ rather than our own spirit.
One way you can look at it is this: I AM soul. I HAVE a spirit. The state of the soul can change, but the nature of the soul cannot.