Who said "You can't control other people—only yourself."?

This quote is attributed to Paul Varjak.

You can't control other people—only yourself. - Paul Varjak

"You can't control other people—only yourself."

Paul Varjak

"I'm not a rat, I'm a human being"

"The only thing that separates us from the animals is our ability to accessorize"

"I don't know how to say goodbye. I'm not good at it"

"You know what's wrong with you? Nothing. That's what's wrong with you"