Self-doubt does more to sabotage individual potential than all external limitations put together.

One of the most important rules for success is this: Every great success is the result of hundreds and thousands of small efforts and accomplishments that no one sees or appreciates.

Whatever job you take on, make yourself valuable, then indispensable.

Keep asking yourself, 'What kind of a company would my company be if everyone in it was just like me?'

Never consider the possibility of failure; as long as you persist, you will be successful.

One of the marks of excellent people is that they never compare themselves with others. They only compare themselves with themselves and with their past accomplishments and future potential.

The history of the human race is the history of ordinary people who have overcome their fears and accomplished extraordinary things.