curses

What is the connection between Kabbalah and black magic, witchcraft and curses.According to Kabbalah all forms of black magic, whether it be curses or spells or other forms of witchcraft are forbidden because they all come from the impure side of creation.  Black magic is unclean, not from a physical sense but from a spiritual sense.G-d created holiness and unholiness in this world, two o