I believe that humans are made up of three parts: the body, the psyche, and the spirit. Each part is essential to a fully functioning human. Each part must therefore be understood and developed. Often a culture or religion will highlight one of the three aspects to the detriment of the other two. Let us look briefly to see how a human is created from these three aspects.
The body is the physical aspect of the human, the flesh and blood. It is the vessel where the psyche and spirit meet. But it is not just an empty vessel. It is essential to the totality of the human. Bodies come in all shapes and sizes and in all modes of health. But there is also a baseline that must be achieved to be human. Once that baseline is met then healthiness can flow out of it. But for many it is a strive just to maintain the baseline and health is far away. Or once a little health is achieved, then it is an easy slide back down. The body is greatly affected by the psyche and the spirit. To achieve health in its truest form, harmony and balance must be sought.
The psyche is Greek for soul. But I have found the psyche is more than just the soul of the person it is also the mind of the person. We will see how this duality is created a little further on. The psyche is the emotional and mental state of the person. It is how one processes the outside world into inward feeling. But it is also the person's character, personality and will. If one is convinced mentally of a sickness or defect, then it is sure to materialize physically. The body will follow the psyche into sickness, but also into health. That is, if health is rightly understood.
The spirit is that part of the human that connects us with the divine, but not just a religious concept of God, but to the energy that is in everything and flows through everything. The spirit is what makes us part of nature. It is the connecting and entangling principles just now being discovered in the areas of quantum physics. It is a force that has limited understanding because science denies it, and religion confuses it with the soul and muddles the idea with theological limitations.
But now to put the pieces together. Think of the three aspects as three triangles, each slightly over lapping another to create a larger triangle. Where the body and the psyche meet you arrive at the mind. Where the psyche and the spirit meet you arrive at the soul. Where the spirit and the body meet you arrive at the quanta (or divine).
So it becomes obvious how all the parts fit to make the whole person. And health is the balance and harmony of the parts working together. Health is not just the absence of sickness, but it is the smooth running and flowing of the parts to create more than just the individual aspects. There are always hiccups and breakdowns, but to have the ability and wisdom to find where the "sickness" originated puts one in the place to restore the balance necessary for health. It is simple, but also very complex. It takes awareness of the self in all three aspects, but it also takes awareness of the awareness, stepping back a step to look at the totality of your being. That is the complexity. Diligence and discipline help us to enact the steps required to restore the proper balance. In essence, could this be quite simple?