"The ultimate authority must always rest with the individual's own reason and critical analysis."

"Optimism is a wonderful quality, and it can be cultivated."

"Our prime purpose in this life is to help others. And if you can't help them, at least don't hurt them."

"I am a very optimistic person. I believe that humanity has the potential to create a better world."

"The 21st century should be a century of dialogue, not violence."