The world owes nothing to any man, but every man owes something to the world.

Invention is 10% inspiration and 90% perspiration.

We don't know a millionth of one percent about anything.

The biggest failure of man is that he gives up before he realizes how close he was to success.

The reason a lot of people do not recognize opportunity is because it usually goes around wearing overalls looking like hard work.

Today, I am wondering what would have happened to me by now, if, fifty years ago, some fluent talker had converted me to the theory of the eight-hour day and convinced me that it was not fair to my fellow-workers to put forth my best efforts in my work? I am glad that the eight-hour day had not been invented when I was a young man. If my life had been made up of eight-hour days, I don't believe I could have accomplished a great deal.

The real measure of success is the number of experiments that can be crowded into 24 hours.