The whole universe is made of energy. This is a universal, scientific and metaphysical law. You may not notice this kind of energy directly but intuitively we know when we are around a person or place that doesn't sit well with our comfort level for whatever reason. Sometimes energy in a room just gets stagnant from not being used or sometimes it could be that a very negative person inhabited the space and turned the energy bad.
No matter what the reason is, houses need energy cleaning just like they need dusting. Doing an energy cleaning or "clearing" to your home can have numerous benefits ranging from bringing physical energy back to its inhabitants, organization, a greater feeling of contentment/cheerfulness, to actually attracting good things to happen within the space.
This philosophy is also well documented and explored in Feng Shui, which is the more in depth philosophy that your home is a metaphor in which each room represents a certain aspect of your external life. Below are my recommendations for clearing unwanted energy from your home:
1) Burn Sage - Sage has a very distinct aroma and as the smoke fills the air, it removes negative spirits and negative energy from the home. The most effective way is to burn a sage torch. I typically walk from room to room letting the smoke fill the room. Note... as a precaution, open the windows so you won't have any smoke alarms going off which is very annoying.
2) Make Holy Water - Boil about a quart of water with petals from about six roses (any color) and add a few drops of your favorite aromatherapy oil. I use a blend called "Joy of Life" which makes your home smell really wonderful. Now let it cool overnight and then strain and pour the mixture into a spray bottle. Spray the corners of every room of your home and around all the doors.
3) Burn a Salt Lamp - Himalayan crystal salt lamps are the perfect way to purify and improve the quality of air in your home. I turn mine salt lamp on usually at night because it has a very distinct glow. The bulb warms the crystals which increases the release of healthy negative ions that help improve the quality and freshness of the indoor air.
Also, playing very soft piano and harp music throughout your home attracts the Angels, they love playing where there's beautiful music around. Lighting candles for beauty/joy/peace/happiness/etc... attracts all these wonderful elements into your home. These are things that you must do ongoing to keep your life peaceful and tranquil.
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