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In the most recent movie Fantastic Beasts, Crimes of Grindelwald the minister said to Dumbledore somthing like "Only you can take on Grindlewald, because he's so powerful". That made me somehow wonder. I know there are many types of magical abilities (Foreseeing, Beast transformations, Mind reading, ...) but what makes a wizard more powerful than others?
The most powerful wizards mentioned are: Dumbledore, Grindelwald and Voldemort (Maybe the fathers of Hogwarts). I don't recall hearing people discribe Harry as powerful.

What makes a wizard more powerful than others? And why can we say that Dumbledore and Grindlewald at their peak were the most powerful?

marked as duplicate by Jenayah, Harry Johnston, Edlothiad, SQB, Mat Cauthon Dec 14 '18 at 10:24

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    I'm not sure this is a duplicate. The question Jenayah cites is asking how does a wizard get powerful while this question is more about how you compare the different magical abilities. – John Rennie Dec 14 '18 at 9:48
  • @JohnRennie the comparison part is tackled (of sorts) in What does it mean that a Wizard is more powerful than another? which is closed as dupe of the above, hence the suggested dupe-target. I think if this is left open, that other one should be reopened as well. (it's only my opinion, though :) ) – Jenayah Dec 14 '18 at 9:59
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    In this particular context, power is, by definition, the ability to defeat other wizards. – Harry Johnston Dec 14 '18 at 9:59