I believe our legacy will be defined by the accomplishments and fearless nature by which our daughters and sons take on the global challenges we face. I also wonder if perhaps the most lasting expression of one's humility lies in our ability to foster and mentor our children.

All the conservation efforts in the world won't be enough to make a dent in the oncoming sustainability crisis our planet faces.

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.

Because I was poor I had one special advantage. When you are poor, and basic survival is your concern, you have no alternative but to be an entrepreneur. You must take action to survive just as you must take action to seize an opportunity.

Just as physical exercise is a well-known and well-accepted means to improve health for anyone, regardless of age or background, so can the brain be put 'into shape' for optimal learning.

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

When you experience a failure as a leader, don't hide it - talk about it. Your missed opportunity will encourage others to take risks.