Who said "Believing something is real doesn't always make it true."?

This quote is attributed to Harry Potter.

Believing something is real doesn't always make it true. - Harry Potter

"Believing something is real doesn't always make it true."

Harry Potter Truth

Character in Harry Potter and the Prisoner of Azkaban

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"A true friend would never stop believing in you."

"Strength comes from within."

"The map shows us something we never dreamed of."

"Some people are worth saving."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."