Andrew Carnegie

“Concentrate your energy, thought, and capital exclusively upon the business in which you are engaged. Having begun in one line, resolve to fight it out on that line, to lead in it; adopt every improvement, have the best machinery, and know the most about it.” ― Andrew Carnegie, The Empire of Business (New York: Doubleday, Page & Co., 1902)

“Concentration is my motto - first honesty, then industry, then concentration.” ― Andrew Carnegie 

“Think of yourself as on the threshold of unparalleled success. A whole, clear, glorious life lies before you. Achieve! Achieve!” ― Andrew Carnegie

“People who are unable to motivate themselves must be content with mediocrity, no matter how impressive their other talents.” ― Andrew Carnegie

“As I grow older, I pay less attention to what men say. I just watch what they do.” ― Andrew Carnegie

“Do not look for approval except for the consciousness of doing your best.” ― Andrew Carnegie

“Do your duty and a little more and the future will take care of itself.” ― Andrew Carnegie

“Don't be afraid to give your best to what seemingly are small jobs. Every time you conquer one it makes you that much stronger. If you do the little jobs well, the big ones will tend to take care of themselves.” ― Andrew Carnegie

“In bestowing charity, the main consideration should be to help those who help themselves.” ― Andrew Carnegie,The Gospel of Wealth

“Whatever I engage in, I must push inordinately.” ― Andrew Carnegie

Andrew Carnegie, “THE ROAD TO BUSINESS SUCCESS: A TALK TO YOUNG MEN“  
From an address to Students of the Curry Commercial College, Pittsburg, June 23, 1885.
http://www.historytools.org/sources/carnegie.html
“To summarize what I have said: Aim for the highest; never enter a bar-room; do not touch liquor, or if at all only at meals; never speculate; never indorse beyond your surplus cash fund; make the firm's interest yours; break orders always to save owners; concentrate; put all your eggs in one basket, and watch that basket; expenditure always within revenue; lastly, be not impatient, for, as Emerson says, 'no one can cheat you out of ultimate success but yourselves.'” ― Andrew Carnegie

“It was a hard life. In the winter father and I had to rise and breakfast in the darkness, reach the factory before it was daylight, and, with a short interval for lunch, work till after dark. The hours hung heavily upon me and in the work itself I took no pleasure; but the cloud had a silver lining, as it gave me the feeling that I was doing something for my world—our family.” ― Andrew Carnegie