Innovation is not about inventing new things, but doing old things in new ways.
No man really knows about other human beings. The best he can do is to suppose that they are like himself.
The P versus NP problem is one of the most important unsolved problems in computer science.
The best moments in our lives are not the passive, receptive, relaxing times... The best moments usually occur if a person's body or mind is stretched to its limits in a voluntary effort to accomplish something difficult and worthwhile.