“How do we know we're not people in a movie?' she asked.I looked at her not knowing how to reply.Mama, [...] how do we know that things are real?'Great. Now we have a junior existentialist in the house.Well, we don't know. We just have to hope that what we think is real is real.'But how do we know?' she asked, insistently.Ah, a scientist, who wants empirical evidence.We don't know. We just have to hope.'Mama, how do we know things aren't a dream? You know, how sometimes life feels like a dream? Do you ever feel that way?'Yes, sweetie, I feel that way all the time.”

“The true test of character is not how much we know how to do, but how we behave when we don't know what to do.”

“Sometimes we know who we want to be and what we want to do long... long before we know how to get there.”

“Some may say that such a girl is not ready for a relationship with a man, especially a man in his late sixties. But to that I say: We don't know anything. We don't know how to cure a cold or what dogs are thinking. We do terrible things, we make wars, we kill people out of greed. So who are we to say how to love. I wouldn't force her. I wouldn't have to. She would want me. We would be in love. What do you know. You don't know anything. Call me when you've cured AIDS, give me a ring then and I'll listen.”

“--Why are we fighting them?--They're mad. We're sane.--How do we know?--That we're sane?--Yes.--Am I sane?--To all appearances.--And you, do you consider yourself sane?--I do.--Well, there you have it.--But don't they also consider themselves sane?--I think they know. Deep down. That they're not sane.--How must that make them feel?--Terrible, I should think. They must fight ever more fiercely, in order to deny what they know to be true. That they are not sane.”

“Ah, my poor child, how far gone you are in your blindness! Why did you have me summoned?""I had hopes, I had hopes.""Hopes? Hopes of what?""I do not know. The things we hope for are always the things we do not know.”