"The only way to do great work is to love what you do."

"I have spent a good deal of my life trying to get people to eat more vitamin C."

"I have always been a teacher, and I believe that education is the key to a better future."

"Well, I thought, that's nice of the old guy to say that, but I'm a little skeptical myself. And as the years went by, I thought, I don't do the sort of work for which Nobel Prizes are given."

"Every time you go to the doctor, the doctor asks you to take off your clothes, and then he looks at you, and he tells you what's wrong with you. But he doesn't know anything about you."