Great entrepreneurs focus intensely on an opportunity where others see nothing. This focus and intensity helps to eliminate wasted effort and distractions. Most companies die from indigestion rather than starvation, i.e. companies suffer from doing too many things at the same time rather than doing too few things very well.

Every day you spend becoming an expert in a field, you become more useless in that field.

The real metric of success isn't the size of your bank account. It's the number of lives in whom you might be able to make a positive difference.

Education should not be about building more schools and maintaining a system that dates back to the industrial revolution. We can achieve so much more, at unmatched scale with software and interactive learning.

Athletes at all ages are bigger and stronger than ever before. And they are being encouraged - sometimes even incentivized, as we recently learned was the case on at least one National Football League team - to play to injure.

Go where your customers take you! For example, did you know that Sony's first product was a rice cooker? Since abandoning the rice cooker, it has merely managed to become the world's biggest consumer electronics company.

Stay focused on the mission.