"No estar absolutamente seguro es, creo, una de las cosas esenciales en la racionalidad."

“When you're at the end of your rope, tie a knot and hold on.”

“You can have a job, or you can have a career, or you can have a calling. If you can someho...”

“People say I make strange choices, but they’re not strange for me. My sickness is that I...”

“These pains you feel are messengers. Listen to them”

“When we strive to become better than we are, everything around us becomes better too.”

“The more you learn, the more you earn.”

“There are winners, there are losers and there are people who have not yet learned how to win.”

“I often speak to people who wonder why they continue to fail. In many situations, they are...”

“Beginnings are usually scary, and endings are usually sad, but it's everything in between ...”

“Friends congratulate me after a quarterly-earnings announcement and say, 'Good job, great ...”

“Success is not the key to happiness Happiness is the key to success”

“All truly great thoughts are conceived while walking”