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You don't have to be kind. You have to be calm. Once you start showing that people can affect your emotions, then you obviously don't have that much power. If a stewardess can affect your emotional life, then you don't have any power in life and you just showed your whole hand.

"Vincent Kartheiser Talks MAD MEN, Why People Prefer Don Over Pete, Gender Roles in the 60s, Jon Hamm’s Directing Skills, and More". Interview with Steve 'Frosty' Weintraub, collider.com. April 27, 2013.
You don't have to be kind. You have to be calm. Once you start showing that people can affect your emotions, then you obviously don't have that much power. If a stewardess can affect your emotional life, then you don't