God wants to give you rest, restore and refresh you. Man is a spirit, has a soul and lives in a body. It is the tripartite arrangement that we find in scripture and theology: God the father, God the Son and God the Holy Spirit; and the outer court, inner court and holy of holies. In the physical world, we have water, vapour and ice.
The soul is the part of you that thinks and chooses; it is your mind. The soul is your will and emotions. Basically, the person you are depends on how you think, feel, the choices you make and how you use your mind. The scripture says, "He restores my soul".