I think he meant that it would be more effective if you were capable of casting the spell yourself without the magic device, via a spellbook, and had learned it. So for instance, a ranger who knows the Magic Missile spell would be able to do more damage with a wand of magic missile than, say, a paladin, who doesn't (and can't) know the Magic Missile spell himself.
I'm guessing the logic behind it is that you know the intricate details behind the spell and how it works, and so would be better at wielding it, even through a magical device, compared to someone who had no personal knowledge of the spell and was using the device to cast a spell they don't personally know.
I'm guessing the logic behind it is that you know the intricate details behind the spell and how it works, and so would be better at wielding it, even through a magical device, compared to someone who had no personal knowledge of the spell and was using the device to cast a spell they don't personally know.
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