Let me share with you the following:
a. Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.
b. I have not failed. I´ve just found 10,000 ways that won´t work.
c. There is no substitute for hard work.
d. I never did anything by accident, nor did any of my inventions come by accident. They came by work.
e. Genius is one percent inspiration and ninety-nine percent perspiration.
Thomas Alva Edison - American Inventor (1847-1931)