“Always, always, always believe in yourself, because if you don't, then who will, sweetie”
Variant: Keep trying, hold on, and always, always, always believe in yourself, because if you don't, then who will?
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Marilyn Monroe 149
American actress, model, and singer 1926–1962Related quotes

“Always believe in your dreams, because if you don't, you'll still have hope.”
Young India (23 March 1924)
1920s

“I always work on the theory that the audience will believe you best if you believe yourself.”
Los Angeles Times interview (1956)
Context: I always work on the theory that the audience will believe you best if you believe yourself. This meant that I had to come to understand Moses well enough to believe in my portrayal of him.

Source: It Worked For Me: In Life and Leadership (2012), p. 36

“Always believe in yourself. Do this and no matter where you are, you will have nothing to fear.”

“Always be yourself, unless you can be Batman, always be Batman.”

http://www.askmen.com/women/models/57c_alessandra_ambrosio.html
Attributed

http://www.washingtonpost.com/wp-dyn/articles/A46503-2004Aug30.html
New York City