“You can not entertain weak, harmful, negative thoughts ten hours a day and expect to bring about beautiful, strong and harmonious conditions by ten minutes of strong, positive, creative thought.”
Source: The Master Key System
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Charles F. Haanel 1
American businessman, author 1866–1949Related quotes

As quoted in The Wilson Era; Years of War and After, 1917–1923 (1946) by Josephus Daniels, p. 624. Referenced in "Bartleby.com" http://www.bartleby.com/73/1288.html
1920s and later

“The weak are wicked. Goodness can only be expected from the strong.”
(15 July 2013) https://twitter.com/paulocoelho
Twitter

“Only the weak are cruel. Gentleness can only be expected from the strong.”

Presidency (1977–1981), 1977

“I need my sleep. I need about eight hours a day, and about ten at night.”
Salvation (2005)