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Originally Posted by ITL 141
Consider: for each spell, a book must give a complex incantation (often
with several variant forms); a list of magical ingredients and acceptable alternatives; general instructions; and something about the history and theory of the spell!
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Evidently, something about the memorization process allows one to skip the ingredients. When you read a spell from a book, you need those ingredients.
Don't ask me why.
In game terms, it's pretty clear. Steve wanted casting spells from a book to be inconvenient. Making the wizard haul around an expensive 10lb. chest does that.