This question already has an answer here:
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?