Editing Magic in Harry Potter (section)

===Emotion===
As explained earlier, young untrained wizards can trigger uncontrolled magic when they are in a state of intense emotion. But emotions also affect trained witches and wizards and their magical abilities. For instance, in ''Half-Blood Prince'', a heartbroken [[Nymphadora Tonks]] temporarily loses her power as a [[Metamorphmagus]] when [[Remus Lupin]] starts distancing himself from her; the form of her [[Patronus Charm|Patronus]] changes to reflect her depression. Another example is [[The House of Gaunt|Merope Gaunt]], who only demonstrated any magical ability when removed from her father's oppression, but then lost it again when her husband abandoned her.

Several magical spells require the use of certain emotions when casting them. The Patronus charm, for example, requires the caster to concentrate on a happy memory.

Love is depicted as a particularly powerful form of magic.<ref name="HP5"/> Lily Potter's voluntary self-sacrifice on Harry's behalf grants him a magical protection that saves him from Voldemort as a baby, and Harry makes a similar sacrifice to save his friends at the end of ''Deathly Hallows''.<ref>{{HPref|book=7}}</ref> A certain key prophecy in the series describes Harry as having "power the Dark Lord knows not", referencing his capacity for love.<ref name="HP5"/>

True love is impossible to create magically, although love potions can create intense infatuation.