“When everything seems to be going against you, remember that the airplane takes off against the wind, not with it.” Henry Ford.
The word is from the French: "entrepedre" to undertake, and originally applied to the director of a musical institution before the meaning broadened to its modern application. Joseph Schumpeter, in his classic work Capitalism, Socialism, and Democracy, to explain the function of the entrepreneur sometimes used his native German term, "undertaker" or undertaker of an enterprise, which didn't translate well into English. President George W. Bush once famously remarked: "The trouble with the French is they don't have a word for 'entrepreneur'"
Studies have shown that entrepreneurs rate themselves as happier than just about any other job category. This is because their businesses allow them to earn their own success and it’s this success that makes them happy. 
- The Free Enterprise System The American Dream.
- Free Enterprise by Fulter Hong
- Motivation and strategies for entrepreneurs. Evan Carmichael.
- Business plans Dell.com.