"A spell is a symbolic act 
done in an altered state of consciousness 
in order to cause a desired change."
To  cast a spell is to project energy through a symbol. It is important to  note that the energy is what is key, not the symbol; too often, the  symbols are mistaken for the agent that casts the spell. While props are  useful at times, it is the mind that works the magic. Correspondences  between colors, planets, metals, numbers, plants and minerals, and  musical notes make up a great deal of magical lore, and particular  objects, shapes, colors, scents, and images do work better than others  to embody certain ideas. The most powerful spells are often improvised  from materials that feel right or that simply happen to come to hand,  however.
Theory of Spellcasting
Spells  are an important aspect of magical training. They require the use of the  combined faculties of relaxation, visualization, concentration and  projection. The casting of spells provides practice in coordinating  these skills and developing them further. Spells are extremely  sophisticated psychological tools that have subtle, but important,  effects on a person's inner growth. Spells may highlight otherwise  hidden complexes of the person casting the spell.
A person who  has conflicts about success will find great difficulty in concentrating  on a money spell, for example. Many times the practical results of a  spell are far less important than the psychological insights that arise  during the magical work, for discovering our inner blocks and fears is  the first step in overcoming them. Spells also go one step further than  most forms of psychotherapy, in that they allow us not only to listen to  and interpret the unconscious, but also to speak to it in the language  it understands.
Symbols, images, and objects used in spells  communicate directly with Younger Self, who is the guardian of our  emotions and who is barely affected by the intellect. We often  understand our feelings and behavior but find ourselves unable to change  them, but through spells, we can attain the most important power - the  power to change our lives.
Spellcasting also forces us to come to  terms with the material world. Many people attracted to the spiritual  path of the Craft find themselves uneasy with using magic for practical  or material goals. Somehow it seems wrong to work magic for oneself, to  want things and to get things. This is an attitude which is a holdover  of the Judeo-Christian world view that sees spirit and matter as  separate and that identifies matter with evil and corruption.
In  the Craft, flesh, the material world, none of what is commonly thought  of as matter is separate from spirit. The universe is made up of the  Goddess who is manifest in all things. Union with the Goddess comes  through embracing the material world and all the gifts that She has  placed in it for us. Our major task on this plane of existence is to  become masters of this realm of manifestation. We do not fight  self-interest; we follow it, but with an awareness that transmutes it  into something sacred.
Mechanics of Spellcasting
Spellcasting  is the lesser, not the greater magic; but the greater magic builds on  the lesser. The paradox is that in spellcasting we may start out working  with the personal self, but in order to work the magic we are forced to  expand and recognize the Self that moves through all beings.
Magic  involves the deliberate self-identification with other objects and  people. For example, to do a healing, we must become the healer, the one  who is healed, and the energy that is to do the healing. To attract  love, we must be able to love ourselves and to become love its self.
Spells  work in two basic ways. The first is through suggestion; symbols and  images implant certain ideas in Younger Self, or the subconscious mind,  and we are then influenced to actualize those ideas. Spells can also  influence the external world.
The theoretical model that witches  use to explain the workings of magic is a clear one and coincides in  many ways with the "new" physics. It is simply an elaborate but  extremely useful metaphor. The metaphor is based on a world view that  sees things not as fixed objects, but as vortexes of energy. The  physical world is formed by the vortexes of energy, and if we cause a  change in the energy patterns they, in turn, cause a change in the  physical world. When our own energy is concentrated and channeled, it  can move the broader energy currents. The images and objects used in  spells are the channels. They are the vessels through which our power is  poured, and by which it is shaped.
As energy is directed into  the images we visualize, it gradually manifests physical form and takes  shape in the material world. Directing energy is not a matter of simply  emoting. Emotion can be likened to a strobe light which provides a very  inconstant light, while directed energy is more like a laser beam. Even  concentrated power is a small stream compared with the vast surges of  energy that surround us. The most adept witch cannot be successful in  all her spells, for the opposing currents are often too strong.
The  craft teaches to first identify the flow of energy and then to decide  whether or not it is going where we want it to go. If it is not, then we  can try to deflect it, or we may have to change our own course. Sensing  the energy climate is a matter of intuition and experience. Some  witches make a study of Astrology in an effort to plan their magical  workings at the optimal times, while others prefer to work when they  feel the time is right.
Of all the planets, the Moon's influence  on subtle energies is the strongest. Subtle power increases as the Moon  waxes, so the time of the waxing Moon is best for spells involving  growth or increase, such as money spells. The power peaks when the Moon  is full and that is the best time for workings of culmination and love.  During the waning Moon, power subsides and turns inward. The waning  Moon's period is used for banishings, bindings, and discovering hidden  secrets. The practical witch soon learns to adjust her spells to fit the  time of the Moon. If, for example, she needs to do a money spell during  the waning Moon, she would put a little 'English' on it and make it a  poverty banishing spell.
Energy pursues the path of least  resistance. Material results are more easily achieved on this plane of  existence through physical actions than through magical workings. For  example, it is simpler to lock your door than suffer the constant drain  from maintaining psychic seals on your doors and windows while you are  away from home. Of course, once you have locked your door, you might  feel more reassured by placing seals on it.
No magic spell is  going to bring results unless channels are opened into the material  world. For example, a job spell is useless if you are not willing to go  out and interview for jobs or at least let potential employers know that  you are in the market for one. In the same vein, a healing spell is no  substitute for medical care.
Most medicine today can be broken  down into two broad categories, emergency medicine and that which is not  needed for immediate life-threatening situations. Emergency medicine  has excelled at stabilizing the body's condition so that it can repair  itself at its own pace. Most other forms of medicine consist of  treatment through surgery or chemotherapy or a combination of both. The  procedures noted above work on the physical body and do not take the  other levels into consideration. Psychic healing works at healing the  higher levels of the person so that the physical heals itself or allows  the person to let go of their physical body if it cannot be repaired. In  either case, the choice rests with the person who is being healed and  not the healer.
Visualization used in creating a spell should  focus on the desired result, not the individual steps leading up to the  result. We give the spell free rein in how it goes about achieving the  results with the understanding that it is not to bring harm to anyone or  any being. For this reason, spells have a habit of working in very  unexpected ways.
To assure that the power we have unleashed does  not inadvertently cause harm, we bind the spell. This serves to 'set'  the form we have created so that the energy becomes fixed in the pattern  we desire. The energy we project to others affects us even more  strongly than the other person. This is because we have generated the  energy, and thus we have become the object at which the energy is  directed. If healing energy is sent out, then the health of the person  casting the spell is enhanced. By the same token, any hex or curse that  is sent out ALWAYS affects the person who sends it no matter whether it  affected the person it was sent at or not.
MAGIC IS NOT TO BE  USED TO GAIN POWER OVER OTHERS. Magic is a technique used in developing  your own 'power from within.' Spells that are directed at gaining power  over others weaken the 'power from within.' Aside from the damage done  to oneself, it is important for another reason. Many people who do not  understand the laws of magic are afraid of being attacked magically and  are given to paranoia. The witch's main stock-in-trade used to be  removing a competitor's hexes and preparing charms to protect their  clients. While true psychic attacks are EXTREMELY RARE, a person's guilt  makes up for any lack, and after using 'forbidden' help, their paranoia  leads them to seek protection from the same person they just turned to  in desperation. Do yourself a favor, and resist the temptation to 'help'  these types. Most magical formularies consist of formulae gathered and  tested by witches as well as many charms to protect the common man from  those same witches who sold them their charms.
Times and Correspondences
I  mentioned earlier that timing and the right props are considered  important in spellcasting. Over the years, systems of Correspondences  were developed which assigned certain attributes and aspects to the  seven ancient planets of Astrology. Each planet was assigned a God or  Goddess, who embodies the attributes the ancients wished to invoke. Each  of the Gods and Goddesses were assigned an hour of the day, color,  incense, metal, number, signature, plant, mineral, musical note, and  animal or bird.
General Guidelines for Casting Spells
Set  aside a room for your magical work. Decorate it with things that put  you in a magical mood. Remember to use things that stimulate all five of  your physical senses. Some obvious things would be the use of  appropriate colors for sight, incense for scent, music for hearing,  wines for taste, and textures for feel.
If you do not have a room  you can set aside exclusively for your magical work, then choose a room  that can be locked while you do your work. This will allow you to work  undisturbed. In any case, you should clean your work area periodically  with a purifying powder/floorwash to keep away negative vibrations.
Set  up an altar to be used as your worktable. It's size and shape should be  those that appeal to you. Placing candles and other items that assist  you to concentrate on the work at hand is a good practice. Some people  like to cover their altar with a white cloth and place fresh cut flowers  on it every day.
Always use the best candles, oils, and incenses  that you can afford, or make your own, for scrimping on materials has a  negative effect on the subconscious. Don't forget that the subconscious  is very good at making do with raw materials that it can shape to its  own use.
Never cast a spell until you have a clear and concise  picture of what it is you wish to accomplish. This ties in with the  saying "Be careful what you wish for, you just might get it."
Always  ground out any extra energy you raise for the spell, and bind the spell  so that it expires within the pre-determined amount of time. Once you  have cast the spell, do not discuss it with any one until after it has  worked. Most spells peter out because the person who cast it boasts  about it to so many people, that the spell is robbed of power before it  has a chance to work. The ancient bond placed on the magician was to  dare, to know and to keep silent.
Above all, at all times,  remember the Rede: "An ye harm none, do what you will." You do not know  all the effects of your spell, therefore, use magick sparingly, if at  all.
Authors Details: Unknown
FROM
http://gypsymagicspells.blogspot.com/2010/08/art-of-casting-spells.html