“Whenever you see a successful business, someone once made a courageous decision.”
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Peter F. Drucker 180
American business consultant 1909–2005
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Source: As quoted from CNN's ‘Larry King Live’ in Colin Powell Leaves Many Leadership Lessons For Corporate Executives, Forbes, October 18, 2021

“The secret of success is sincerity. Once you can fake that you've got it made.”
As quoted in Murphy's Law Book Two : More Reasons Why Things Go Wrong (1980) by Arthur Bloch, p. 47; similar statements became a routine part of the comedic performances of George Burns.
Attributed

“Any time you see someone more successful than you are, they are doing something you aren't.”
The Autobiography of Malcolm X (1965)

“Once a decision was made, I didn't worry about it afterward…”
Source: Lady of Mazes (2005), Chapter 24 (p. 265).

“Once I made a decision, I never thought about it again.”

“It is not by recognizing the want of courage in someone else that you acquire courage yourself..”
Source: Culture and Value (1980), p. 44e

Misquoted by Mitt Romney " These Hands http://www.youtube.com/watch?v=fLZpMFbxyxU" campaign ad ()
[2012-07-19, Romney video deceptively edits Obama speech to make it sound anti-business, Greg, Sargent, The Plum Line, The Washington Post, http://www.washingtonpost.com/blogs/plum-line/post/the-morning-plum-romney-video-deceptively-edits-obama-speech-to-make-it-sound-anti-business/2012/07/19/gJQAoRpavW_blog.html, 2012-10-08]
The Web version of the ad http://www.youtube.com/watch?v=4Lr49t4-2b8 uses a <span style="color:grey">longer misquote</span>: "If you've been successful, you didn't get there on your own. You didn't get there on your own. I'm always struck by people who think, "well, it must be because I was just so smart." There are a lot of smart people out there. "It must be because I worked harder than everybody else." Let me tell you something — if you've got a business, you didn't build that. Somebody else made that happen.
Splices two parts of a speech in Roanoke, Virginia on (see above). Full quote:
<p>There are a lot of wealthy, successful Americans who agree with me — because they want to give something back. They know they didn't — look, <span style="color:darkgrey">if you've been successful, you didn't get there on your own.</span> <span style="color:grey">You didn't get there on your own. I'm always struck by people who think, "well, it must be because I was just so smart." There are a lot of smart people out there. "It must be because I worked harder than everybody else." Let me tell you something —</span> there are a whole bunch of hardworking people out there.</p><p>If you were successful, somebody along the line gave you some help. There was a great teacher somewhere in your life. Somebody helped to create this unbelievable American system that we have that allowed you to thrive. Somebody invested in roads and bridges; <span style="color:darkgrey">if you've got a business, you didn't build that. Somebody else made that happen.</span> The Internet didn't get invented on its own. Government research created the Internet so that all the companies could make money off the Internet.</p>
Misattributed