Who said "Fame is a fickle friend."?

This quote is attributed to Gilderoy Lockhart.

Fame is a fickle friend. - Gilderoy Lockhart

"Fame is a fickle friend."

Gilderoy Lockhart

Character in Harry Potter and the Chamber of Secrets

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"Magical ability is a supreme gift."

"Gilderoy Lockhart never fails to deliver."

"Memory charm gone wrong."

"I'm not a very good teacher, am I?"