"I don't know what's the matter with people: they don't learn by understanding; they learn by some other way — by rote or something. Their knowledge is so fragile!"

"I'm not a popularizer. I'm not trying to tell the public what to think. I'm just telling them what I think."

"I don't think there's any such thing as a 'best' way to do anything. There's just what works."

"The thing that bothers me is that I can tell that the students don't understand. They are taught to remember things, but they don't understand."

"I would rather have a world with five billion people that are happy and healthy and well-fed and full of wonderful things than a world with twenty billion people who are starving and miserable."