Related quotes
“Don't cry over spilled milk. By this time tomorrow, it'll be free yogurt.”
Stephen Colbert (1964) American political satirist, writer, comedian, television host, and actor
"The Colbert Report," November 12, 2009.
“It’s no use crying over spilt evils. It’s better to mop them up laughing.”
Eleanor Farjeon (1881–1965) English children's writer
Gypsy and Ginger (1920)
“Inutile piangere sul latte versato. (No use crying over spilled milk.)”
Francesca Marciano (1955) Italian actor, film director, screenwriter and writer
Source: Casa Rossa
“Don't cry because it's over. Smile because it happened.”
Dr. Seuss (1904–1991) American children's writer and illustrator, co-founder of Beginner Books
Often attributed to Dr. Seuss without citation; also cited as an anonymous proverb.
This quote has also been attributed to Gabriel García Márquez, in Spanish: "No llores porque ya se terminó, sonríe porque sucedió."
Compare lines from In Memoriam A.H.H. of Tennyson:
  'Tis better to have loved and lost
  Than never to have loved at all.
Disputed
Variant: Don't cry because it's over, smile because it happened.
“Don't cry. The damned don't cry.”
Eugene O'Neill (1888–1953) American playwright, and Nobel laureate in Literature
Page 253.
Mourning Becomes Electra (1931)
“Never cry over anything that can't cry over you”
John Marsden (1950) author
Source: The Other Side of Dawn