"If you're not curious, you're not human."

"My biggest fear is that people will stop being curious. That they'll stop asking questions, and just accept what they're told."

"I'm not saying there's no God. I'm saying if there is a God, he's an absentee landlord."

"I'm not a guru. I'm just a guy who knows a lot about space."

"The problem with society is not lack of knowledge, but the illusion of knowledge."