Who said "I have learned that people are capable of great things."?

This quote is attributed to John Watson.

I have learned that people are capable of great things. - John Watson

"I have learned that people are capable of great things."

John Watson Inspiration

"I'm a doctor, not a magician."

"You know what? I don't actually care what you think."

"Afghanistan or Iraq?"

"How did you know about the bullet wound?"

"The best part of living is knowing you survived."

"The world needs heroes."

"Life is too short to live poorly."

"I'd rather be an optimist and be wrong than a pessimist and be right"