When the subject of the Trinity comes up, Christians either have only a vague notion, or give long winded yet diluted and confusing explanations. I think the explanation is very simple:
We are all made in the image of God which means that we have 3 parts just like God does: soul, spirit and body. The soul corresponds to the Holy Father, the spirit to the Holy Spirit, and the body corresponds to the Son.
The extrapolation from man to God is easier to do, rather than trying to start with God, who is ultimately unknowable. But even at this, the distinction between soul and spirit is something that is very poorly understood, if at all, by the great majority of people. In that regard I think that the extrapolation from God to man reveals more:
The Holy Father is the alpha and the omega, unchanging and eternally the same. Similarly, Origen, one of the most important Church fathers of 2nd and 3rd century, stated that all souls are uncreated and that only spirits are created. The Holy Spirits is not quite the same as the Holy Father, it does change over time, for example, when Jesus left this world the Holy Spirit underwent a change. "I will send you a Comforter." In other words the role of the Holy Spirit suddenly became more pronounced. Similarly the spirit can go through radical changes, is created and can even be destroyed.
We are all made in the image of God which means that we have 3 parts just like God does: soul, spirit and body. The soul corresponds to the Holy Father, the spirit to the Holy Spirit, and the body corresponds to the Son.
The extrapolation from man to God is easier to do, rather than trying to start with God, who is ultimately unknowable. But even at this, the distinction between soul and spirit is something that is very poorly understood, if at all, by the great majority of people. In that regard I think that the extrapolation from God to man reveals more:
The Holy Father is the alpha and the omega, unchanging and eternally the same. Similarly, Origen, one of the most important Church fathers of 2nd and 3rd century, stated that all souls are uncreated and that only spirits are created. The Holy Spirits is not quite the same as the Holy Father, it does change over time, for example, when Jesus left this world the Holy Spirit underwent a change. "I will send you a Comforter." In other words the role of the Holy Spirit suddenly became more pronounced. Similarly the spirit can go through radical changes, is created and can even be destroyed.

