Who said "The human heart. A surprisingly resistant thing."?

This quote is attributed to Death.

The human heart. A surprisingly resistant thing. - Death

"The human heart. A surprisingly resistant thing."

Death Strength

Character in The Book Thief

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"I have hated words and I have loved them, and I hope I have made them right."

"The consequence of this is that I'm always finding human bones at number 33."

"I am haunted by humans."

"She was a girl who decided to steal books."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."