“When you came you cried and everybody smiled with joy; when you go smile and let the world cry for you.”
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Rabindranath Tagore 178
Bengali polymath 1861–1941Related quotes
“3. When he smiles at you, sometimes you feel like crying.”
Source: Ouran High School Host Club, Vol. 13

That's when it's really sad.
Rolling Stone magazine/iTunes podcast (December 2005)
On the "chin-up sad" tone of one of his new songs on his upcoming album "Continuum"

“I'm in heaven, I'm in heaven
I'm in heaven when you smile, when you smile.”
Jackie Wilson Said (I'm in Heaven When You Smile)
Song lyrics, Saint Dominic's Preview (1972)

“You might not believe it… but you make the world a better place when you smile.”
Variant: The world is a better place when you smile
Source: The Guardian
“What are you looking at? Hale asked.
Why are you smiling? I worry when you smile.”
Source: Uncommon Criminals

“If you smile when you are alone, then you really mean it.”