Who said "You are not defined by your greatest regret."?

This quote is attributed to Mrs. Elm.

You are not defined by your greatest regret. - Mrs. Elm

"You are not defined by your greatest regret."

Mrs. Elm

Character in The Midnight Library

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"Every choice you make is a choice you didn't make."

"The only thing you really have to decide is what to do with the time that is given you."

"Your life is not a mistake. Even the parts that don't feel right."

"The things that haunt us are often the things we didn't do."