How does Conscious Mind and Sub-concious Mind interact with each other?

The necessary interaction of the conscious and subconscious mind requires a similar interaction between the corresponding systems of nerves.

According to J. Troward  the beautiful method in which this interaction effected is: The cerebro-spinal system is the organ of the conscious mind and the sympathetic is the organ of the subconscious.  The cerebro-spinal is the channel through which we receive conscious perception from the physical senses and exercise control over the movements of the body.  This system of nerves has its center in the brain.
The Sympathetic System has its center in a ganglionic mass at the back of the stomach known as the Solar Plexus, and is the channel of that mental action which unconsciously supports the vital functions of the body.
The connection between the two systems is made by the Vagus nerve which passes out of the cerebral region as a portion of the voluntary system to the thorax, sending out branches to the heart and lungs, and finally passing through the diaphragm, it loses its outer coating and becomes identified with the nerves of the Sympathetic System, so forming a connecting link between the two and making human physically a “single entity”

All Power is from within

We cannot express powers that we do not possess.
The only way by which we may secure possession of power is to become conscious of power.
And we can never become conscious of power until we learn that all power is from within.
We all have a world within us – a world of thought and feeling and power; of light and life and beauty and, although invisible, its forces are mighty.
The world within is governed by our mind.
When you discover this world you will find the solution for every problem, “the cause” for every “effect”
Outside world is only a reflection of the world within.
In the world within may be found infinite Wisdom, infinite Power, infinite Supply of all that is necessary, waiting for unfoldment, development and expression.
Harmony in the world within will be reflected in the Outside world by harmonious conditions, good manifestations, and the best of everything.
It is the foundation of health and a necessary essential to all greatness, all power, all attainment, all achievement and all success.
What does Harmony in the world within means?
The ability to control your thoughts, and to determine for ourselves how any experience is to affect us.
Harmony in the world within results in optimism and affluence; affluence within results in affluence in the outside world.
The outside world reflects the circumstances and the conditions of the consciousness within.
If you find wisdom in the world within, you will have the understanding to discern the marvelous possibilities that are latent in this world within, and you will be given the power to make these possibilities manifest in the outside world.
As you become conscious of the wisdom in the world within, you mentally take possession of this wisdom, and by taking mental possession you come into actual possession of the power and wisdom necessary to bring into manifestation the essentials necessary for your most complete and harmonious development.
The world within is the practical world in which tens of thousands of men and women of power generate courage, hope, enthusiasm, confidence, trust and faith, by which they are given the fine intelligence to see the vision and the practical skill to make the vision real.