Who said "I don't know why, but it is."?

This quote is attributed to Holden Caulfield.

I don't know why, but it is. - Holden Caulfield

"I don't know why, but it is."

Holden Caulfield Philosophy

Character in The Catcher in the Rye

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"It kills me. It really does."

"I'm the most terrific liar you ever saw in your life."

"Phoniness kills me. It really does."

"I really do. That's the thing about me. I'm quite the sexfiend."

"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."