Why bury candles?

If you do a spell that does not use the full candle, (e.g: A spell to break negative energy or to break a curse), that candle cannot be used to another purpose, and the witch have to get rid of the candle so that it does not fal in to someone else's hand, (for their own good). Therefor, when the best thing to do is to bury the remaining half, they bury it.
If you do a spell that does not use the full candle, (e.g: A spell to break negative energy or to break a curse), that candle cannot be used to another purpose, and the witch have to get rid of the candle so that it does not fal in to someone else's hand, (for their own good). Therefor, when the best thing to do is to bury the remaining half, they bury it.