Here’s an interesting quote by Charles Haanel:

“It is through the law of vibration that the mind exercises control over the body. We know that every mental action is a vibration, and we know that all form is simply a mode of motion, a rate of vibration. Therefore, any given vibration immediately modifies every atom in the body, every life cell is affected and an entire chemical change is made in every group of life cells.

Everything in the Universe is what it is by virtue of its rate of vibration. Change the rate of vibration and you change the nature, quality and form. The vast panorama of nature, both visible and invisible, is being constantly changed by simply changing the rate of vibration, and as thought is a vibration we can also exercise this power. We can change the vibration and thus produce any condition which we desire to manifest in our bodies.

We are all using this power every minute. The trouble is most of us are using it unconsciously and thus producing undesirable results. The problem is to use it intelligently and produce only desirable results. This should not be difficult, because we all have had sufficient experience to know what produces pleasant vibration in the body, and we also know the causes which produce the unpleasant and disagreeable sensations.

All that is necessary is to consult our own experience. When our thought has been uplifted, progressive, constructive, courageous, noble, kind or in any other way desirable, we have set in motion vibrations which brought about certain results. When our thought has been filled with envy, hatred, jealousy, criticism or any of the other thousand and one forms of discord, certain vibrations were set in motion which brought about certain other results of a different nature, and each of these rates of vibration, if kept up, crystallized in form. In the first case the result was mental, moral and physical health, and in the second case discord, inharmony and disease.”

In this quote, Charles Haanel emphasizes that the mind controls the body through the law of vibration.

The New Thought “law of vibration” is quite simple and state that everything in the universe, including our thoughts, is in constant motion, as vibrations. Every thought creates a vibration that affects the body and environment, influencing physical, mental, and emotional states.

So, by consciously directing positive, constructive thoughts, we can change our personal vibration and produce health, harmony, and desirable outcomes, while negative thoughts create discord and imbalance.

Essentially, our mind influences reality through the vibrations it sends out. The first step is to notice this, and the next is to consciously adjust those vibrations. And as we know, this is where the problems arise.