“It's not the cost (although that pinches), or the time (though that grinds). After a while, it's the sheer galling indignity of being asked to prove, pay, and prove all over again that you're a worthy parent. Any true parent will tell you that that is impossible to prove in advance.”

“So my antagonist said, "Is it impossible that there are flying saucers? Can you prove that it's impossible?" "No", I said, "I can't prove it's impossible. It's just very unlikely". At that he said, "You are very unscientific. If you can't prove it impossible then how can you say that it's unlikely?" But that is the way that is scientific. It is scientific only to say what is more likely and what less likely, and not to be proving all the time the possible and impossible.”

“You're not asking for input. You are asking your admirer's to prove they are paying attention.”

“Physics advances by accepting absurdities. Its history is one of unbelievable ideas proving to be true.”

“Just because an idea is true doesn't mean it can be proved. And just because an idea can be proved doesn't mean it's true.”

“What takes more guts? To fight for your own life at any cost—or prove that you're willing to lose it?”