Who said "The human heart is a bottomless pit of secrets"?

This quote is attributed to Monte Cristo.

The human heart is a bottomless pit of secrets - Monte Cristo

"The human heart is a bottomless pit of secrets"

Monte Cristo Philosophy

Character in The Count of Monte Cristo

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"Revenge is the lash of the scorpion."

"I am no bird; and no net ensnares me."

"My heart is a sepulcher in which I have entombed my past."

"Blessed are the merciful, for they shall obtain mercy."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."