Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.
Thomas A. EdisonThe first requisite for success is to develop the ability to focus and apply your mental and physical energies to the problem at hand - without growing weary. Because such thinking is often difficult, there seems to be no limit to which some people will go to avoid the effort and labor that is associated with it.
Thomas A. EdisonGenius is one percent inspiration and ninety-nine percent perspiration. As a result, a genius is often a talented person who has simply done all of his homework.
Thomas A. Edison