I always thought about this whenever I saw Harry Potter movies or read books, that where exactly magic lies? Is it in wizards or wands? As mentioned in , Harry is able to make the glass disappear. Then in  he blows away his aunt without even touching the wand. So if magic is possible without wands why do they need it in the first place? Also, Ollivander tells Harry that wand chooses the wizards, so does wand actually have magic? Kindly help.
So in the first 5 or 6 books, it was very clear that the wand chooses the wizard and the power/level of the spells the wizard produces is based on the knowledge and skill of the wizard.  This is referenced by people constantly being telling Harry that he wasn't skilled enough to perform certain spells, or Bellatrix telling Harry that he needed to mean the Cruciatus curse for it to be effective.  However, in the 7th book, this entire idea is changed to the wand being the thing that's powerful and regardless of the wizard's/witch's skill or knowledge, he/she could still perform a very advanced spell if it's something the wand could handle.  Goyle accidentally creating a fire serpent is something that instantly comes to mind from the movies(I don't remember if that happened in the book).  So, my question is, what actually holds the power, the wizard/witch, or the wand?
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