Source: https://www.goodreads.com/quotes/11654667-believing-in-yourself-and-having-a-positive-mindset-is-the
“The first step is, if you don't believe it yourself your team darn sure won't.”
[Rex Ryan's press conference, http://espn.go.com/blog/new-york/jets/post/_/id/953/rex-ryans-press-conference-2, ESPN, McManus, Jane, August 6, 2010, http://www.webcitation.org/5x46RBB2S, March 9, 2011, March 9, 2011]
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Rex Ryan 5
American football coach 1962Related quotes

“Don't settle for a relationship that won't let you be yourself.”
“If you don't believe in yourself, then who will believe in you?”
Attributed to Korda in The Power of Choice (2007) by Joyce Guccione, p. 52, the earliest occurrence of such phrasing yet located is by Martin Lawrence, in "What Up?" in Upscale : The Successful Black Magazine (February 1993), p. 79: "If you don't believe in yourself, then who will believe in you? The next man's way of getting there might not necessarily work for me, so I have to create my own ways of getting there."
Disputed

“Never make excuses. Your friends don't need them and your foes won't believe them.”
Source: Wooden: A Lifetime of Observations and Reflections On and Off the Court

“It was so darn quiet you could hear your hair grow.”
Source: Farmer in the Sky (1950), Chapter 13, “Johnny Appleseed” (p. 131)

Interview with Cawaii, December 2007

God doesn't believe in atheists (2002)

“If you don't believe in yourself, who will?' ~Maybeck”
Source: Disney after Dark