“Emotion is contagious.”
Source: The Tipping Point: How Little Things Can Make a Big Difference
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Malcolm Gladwell 70
journalist and science writer 1963Related quotes

Source: The Gifts of Imperfection: Let Go of Who You Think You're Supposed to Be and Embrace Who You Are

"Would you like to see a little of it?" said the Mock Turtle. (3 April 2010)
Unfit for Mass Consumption (blog entries), 2010
Context: Could anything be more inimical to art than a fear of emotion, or a fear of "excessive" emotion, or a reluctance to express emotion around others? No, of course not. Art can even best the weights of utter fucking ignorance and totalitarian repression, but it cannot survive emotional constipation.
I want a T-shirt that says, "Art is Emo." We live in an age where people are more apt to believe a thing if they read it on a T-shirt.
“Love affairs are for emotional sprinters; the pleasures of love are for the emotional marathoners.”

“Learn to use your emotions to think, not think with your emotions.”
Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!
Source: Rich Dad, Poor Dad
Source: Way of the Peaceful Warrior

Literary Essays, vol. II (1870–1890), Rousseau and the Sentimentalists

“Emotions are a cancer in one's path to the road of prosperity in life, Emotions Defeat Reason.”
Quoted from his first book https://en.wikipedia.org/wiki/Success_and_Failure_Based_on_Reason_and_Reality, "Success and Failure Based on Reason and Reality" https://www.amazon.co.uk/SUCCESS-FAILURE-BASED-REASON-REALITY/dp/9970983903/ on Amazon, (July 2018)