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Certainly you can steal a soul. Soul = Purpose. Give your Purpose to 'Satan' and get some benefit in return. Theoretically.
I do not know for a fact vagrant dreamer that this is true. You state it, but that does not prove it or make it a fact. I do not wish to blindly believe what you state.
Its nice to support your opinion a little, to help us "lesser neophytes" understand.
Bloodarchon, to answer your question, first we must know what you mean by "the soul". Then we can perhaps answer if it is possible to steal someones soul.
But now we have no clue what the soul is.
It means so many different things in different schools of magick, there is no clear cut answer to this question, unless you specify wich soul you are talking about.