“Before you can inspire with emotion, you must be swamped with it yourself. Before you can move their tears, your own must flow. To convince them, you must yourself, believe.”
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Winston S. Churchill 601
Prime Minister of the United Kingdom 1874–1965Related quotes
“Before facing you enemy, you must first face yourself.”
Source: Bleach―ブリーチ― 33 [Burīchi 33]

As quoted in A Galaxy Not So Far Away : Writers and Artists on Twenty-five Years of Star Wars (2002) by Glenn Kenny, p. 99

Memoirs (trans. Machen 1894), book 1 (Venetian Years), chap. 14 http://etext.library.adelaide.edu.au/c/casanova/c33m/chapter14.html
Referenced
“But you can vanquish the demons only when you yourself are convinced of your own worth.”
Source: Chinese Cinderella: The True Story of an Unwanted Daughter


“You have to expect things of yourself before you can do them.”
Variant: You must expect great things of yourself before you can do them.

A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Sunday

Love – That’s All Cary Grant Ever Thinks About (1964)
Context: Do not blame others for your own mistakes. … YOU are Mother Nature. You have the power within you to be thin or fat, as you desire. … God is within you, and you can do and have anything you want. You must love yourself more. … and then … you can love your fellow man.
Knowing Yourself: The True in the False (1996)