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

This quote is attributed to Mrs. Elm.

The things that haunt us are often the things we didn't do. - Mrs. Elm

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

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."

"You can't live every life, but you can live this one fully."