Who said "I solemnly swear that I am up to no good."?

This quote is attributed to Harry Potter.

I solemnly swear that I am up to no good. - Harry Potter

"I solemnly swear that I am up to no good."

Harry Potter Adventure

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."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."