“The biggest mistake we could ever make in our lives is to think we work for anybody but ourselves.”
“We shall make mistakes; and if we let these mistakes frighten us from our work we shall show ourselves weaklings.”
1900s, The Strenuous Life: Essays and Addresses (1900), National Duties
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Theodore Roosevelt 445
American politician, 26th president of the United States 1858–1919Related quotes

1850s, The House Divided speech (1858)
Context: Of strange, discordant, and even hostile elements, we gathered from the four winds, and formed and fought the battle through, under the constant hot fire of a disciplined, proud, and pampered enemy. Did we brave all them to falter now? — now, when that same enemy is wavering, dissevered, and belligerent? The result is not doubtful. We shall not fail — if we stand firm, we shall not fail. Wise counsels may accelerate, or mistakes delay it, but, sooner or later, the victory is sure to come.

Page 23.
Golden Booklet of the True Christian Life (1551)

“To-day, let us rise and go to our work. To-morrow, we shall rise and go to our reward.”
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 131.

Speech delivered in the gardens of the Shaab Hall (May 1, 1959).
Principles of the 14th July Revolution (1959)

“There is no mistake; there has been no mistake; and there shall be no mistake.”
In response to William Huskisson declaring there had been a mistake, and he had not intended to resign, after Wellington chose to interpret a letter to him detailing his obligation to vote for a measure opposed by him as a letter of resignation. As quoted in The Military and Political Life of Arthur Wellesley: Duke of Wellington (1852) by "A Citizen of the World", and in Wellingtoniana (1852), edited by John Timbs.

Source: Mad Cowboy (1998), Ch. 4: From the Farm to the Capital, pp. 80-81