I never did anything by accident, nor did any of my inventions come by accident; they came by work.

A teacher sent the following note home with a six-year-old boy 'He is too stupid to learn.' That boy was Thomas A. Edison.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.

It is apparent to me that the possibilities of the aeroplane, which two or three years ago were thought to hold the solution to the [flying machine] problem, have been exhausted, and that we must turn elsewhere.

If there is a better solution... find it.

A man’s best friend is a good wife.

I have not failed 700 times. I have not failed once. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.