I forgot to shake hands and be friendly. It was an important lesson about leadership.

There is no substitute for accurate knowledge. Know yourself, know your business, know your men.

The great issues facing us today are not Republican issues or Democratic issues. The political parties can debate the means, but both parties must embrace the end objective, which is to make America great again.

Motivation is everything. You can do the work of two people, but you can't be two people. Instead, you have to inspire the next guy down the line and get him to inspire his people.

If we wait until we've satisfied all the uncertainties, it may be too late.

In times of great stress or adversity, it's always best to keep busy, to plow your anger and your energy into something positive.

From what I've seen, you either get grounded in that kind of positive thinking early on in life or you don't. Establishing priorities and using your time well aren't things you can pick up at the Harvard Business School. Formal learning can teach you a great deal, but many of the essential skills in life are the ones you have to develop on your own.