What would you consider to be your most powerful tool?

This will depend massively on who you ask. You will get very different answers whenever you ask this question. You may occasionally be told that the feather bound, crystal embedded sage smudge wand cut from the tallest elder tree at midnight is a witch’s favourite tool (lol) but I think its unlikely. Most witches will value their intuition and instinct higher than any single physical item that serves them in their craft.
And as you’re asking me, I’ll give you my answer. And my answer is common sense.
Witches need common sense to discern when magic is a good idea or when a practical solution may be more appropriate.  They need common sense to sift through the reams and reams of published information on Paganism and pull out the truth from amid all the nonsense. Common sense is needed to help identify the fakers, the ego trippers and the people who use the craft to further their own ends or to prey on the vulnerable.
Value your quartz tipped wand by all means but value your common sense as well.

Image http://www.sxc.hu/browse.phtml?f=view&id=984541 (Topfer)

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