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I read on many sites that there are actually some rituals you are supposed to do before doing a spell. Like cleaning yourself of sin, something like that? Bathing yourself in water with essential oils, whatever. So I'm wondering, is that really necessary?

*And should I open the circle before doing a spell?

Clensing is mainly a personal preference. I usually do it because I feel it helps get rid of negetive energy that may be lingering around and possibly interfere with whatever it is I'm doing. Its a way of starting fresh so that all my energy can be properly focused on what I'm trying to achieve.

Casting circle on the other hand...I wouldn't say its nessisary, but I highly reccomend you do some kind of circle to protect yourself. Magic work can attract all kinds of energies and spiritual beings; some of which may be helpful and others which can be quite negative and harmful. The point of the circle is 1) to form a protected space where you are safe from outside energies you do not want interfering, and 2) to have a place to gather your own energies and contain them until you are ready to release them to the universe. In my opinion, a circle is extremely important to any kind of ritual or magic that you do.

That being said, casting circle doesn't have to be a lengthy, complicated process. If you are short of time, or simply don't want to spend much effort casting circle, you can simply take a minute to envision yourself and your work area surrounded by a large bubble of white light that only good may pass through. It will take 30 seconds of your time and should be sufficient.

It is not necessary, but I think its a good idea if just for the fact that it puts you in ritual mindset and helps one focus. If for some reason I'm in a hurry I just use sage to cleanse.