Sources Of Power, concerning where magic is drawn from Options

There was a post somewhere on SMF recently about where magick comes from- once again the search function confounds me so I don't have the post for you. The people who responded to the topic seemed to agree that magick in an external phenomenon. Whether in it is drawn from objects/spirits/gods/exc. or redirected from ambient space, the magus's will is the force that directs the magick.

That conclusion also works with Five standard models of magick.
In Taoist sorcery and internal alchemy sympathy between the body, which is considered a hologram of the larger universe, and some external object is used to alter said object. However, I have never ran across any system other than some bad fantasy books that suggests there is any internal power source that could run a spell.

My question then is what is internal magick. Providing that we assume the magus is part of the Whole from which magick derives, is his power limited (I use them term very loosely) to acts of will that need external power or can some internal source be taped?

Im inclined to say that it all comes down too will, where that will originates from is the ticket
spells to make something happen that you need are easier, its about inclination what purpose dose it hold? what drives a person..

I'd say that the 3 primary reasons to do something stem from the following
1)Animal instinct, hungry? need sex need warmth need safety, need to protect your chrildren, personal selfish essential stuff gets pretty transpersonal when you accept that evolution needs you to be close to other people an have an ability to imagine what you might need in the future.
2)Understanding, to view a beautiful sunset or a ruined old car can be an uplifting experience, to understand the inner workings of a clock gives you power over the clock
energy is everywhere, everything is made of energy, we all know that, what turns that energy of mundane things into magic is understanding those things, experiencing them and being experienced
by them, in that sence people and animals are easy to understand and be understood in kind so we love them more than clocks, generaly.
understanding is a absolute that doesn't truly exist without a sense of identity and a framework of none existence to balance.
3)Belief, if understanding is the utilization of what is there then belief is the creation of something new by denying the existence of whatever it might not be. To have faith in a magic is to feel its identity, to understand how it's effecting things but to neither identify with nor understand its creation/existence directly.

Thats all quite poorly written but could be summed up quite easily by saying 1)body 2)mind 3)spirit or even 1)mutable 2)fixed 3)cardinal

The internal/external debate was never going to last long, if you ask me its all personal, which to me includes everyone ive ever met everything ive ever seen and everything in the whole bloody universe.

Of coarse trying to define 'sources of power' is futile, words can only chip away at the edges of what is essentialy the kind of stuff that is only revieled when all is gone.
good fun trying though.

First post, lovely forum, just what ive been looking for.