Here’s an interesting quote by Charles Haanel:

“The Solar Plexus has been likened to the sun of the body, because it is a central point of distribution for the energy which the body is constantly generating. This energy is very real energy, and this sun is a very real sun, and the energy is being distributed by very real nerves to all parts of the body, and is thrown off in an atmosphere which envelops the body.

If this radiation is sufficiently strong the person is called magnetic; he is said to be filled with personal magnetism. Such a person may wield an immense power for good. His presence alone will often bring comfort to the troubled minds with which he comes in contact.

When the Solar Plexus is in active operation and is radiating life, energy and vitality to every part of the body, and to everyone whom he meets, the sensations are pleasant, the body is filled with health and all with whom he comes in contact experience a pleasant sensation.

If there is any interruption of this radiation the sensations are unpleasant, the flow of life and energy to some part of the body is stopped, and this is the cause of every ill to the human race, physical, mental or environmental.

Physical because the sun of the body is no longer generating sufficient energy to vitalize some part of the body; mental because the conscious mind is dependent upon the subconscious mind for the vitality necessary to support its thought, and environmental because the connection between the subconscious mind and the Universal mind is being interrupted.

The Solar Plexus is the point at which the part meets with the whole, where the finite becomes Infinite, where the Uncreate becomes create, the Universal becomes individualized, the Invisible becomes visible. It is the point at which life appears, and there is no limit to the amount of life an individual may generate from this Solar centre.”