In any case, I came across the following quote, which really set the tone:
If Magick is a form of knowledge, then the Magician should be seen as a seeker after knowledge. He is not a mere weapons technologist, as presented in some FRP games. He will not serve gold or power hungry individuals. Nor will he act as a heavily armed magical escort for glory-seeking adventurers simply because they need a compact magical S.W.A.T. team to take care of really dangerous foes. He has little interest in gaining possession of the magical devices of other Mages, because he can produce his own. His sole passion is to learn all of the secrets of the Arcane Arts -- the very secrets of the universe as he sees it. He is curious. He has to know the Truth! That Truth will most certainly give him great Powers, but it is in the knowing, not the exercise of Power, that the Magician finds his fulfillment ...I won't speak for anyone else, but found these passages quite evocative and compelling. They're a good example of understanding that magic should be, well, magical and not ersatz technology. The magic-user in D&D, even in its earliest versions, often strays a little too close to being "a mere weapons technologist" and that's a shame, because nothing about magic should ever be so simple or straightforward.
This does not rule out the excitement of an adventure. Only the Magician has some deep motive for going. He stands to learn something new or is attempting to forestall some terrible disaster. He doesn't go for ordinary reasons; for he is not an ordinary man.