“If you've got the truth you can demonstrate it. Talking doesn't prove it.”

“In the end, all that ultimately matters is what you've done. Not what you've said, or promised, or intended. This is a hard lesson for me because I can talk a great game. I would like talk to count. But it doesn't, not in the final tally. If I've told someone I love her and have not demonstrated my love with fidelity and care and long-term commitment, then in the end, my talk of love matters little. ”

“You can't just eat good food. You've got to talk about it too. And you've got to talk about it to somebody who understands that kind of food.”

“You can't prove that something doesn't exist. You can only prove that something does exist.”

“If you want to change people's minds, you've got to talk to their elephants.”

“Since faith rests upon infallible truth, and since the contrary of a truth can never be demonstrated, it is clear that the arguments brought against faith cannot be demonstrations, but are difficulties that can be answered.”