“Good and Evil are names for what people do, not for what they are...stopped believing there was a power of good and evil. That they were outside of us...People are too complicated for labels.”

“I stopped believing there was a power of good and a power of evil that were outside us. And I came to believe that good and evil are names for what people do, not for what they are.”

“And I came to believe that good and evil are names for what people do, not for what they are. All we can say is that this is a good deed, because it helps someone or that's an evil one because it hurts them. People are too complicated to have simple labels.”

“People are too complicated to have simple labels.”

“Religion grants its adherents malign, intoxicating and morally corrosive sensations. Destroying intellectual freedom is always evil, but only religion makes doing evil feel quite so good.”

“The kingdom of heaven promised us certain things: it promised us happiness and a sense of purpose and a sense of having a place in the universe, of having a role and a destiny that were noble and splendid; and so we were connected to things. We were not alienated. But now that, for me anyway, the King is dead, I find that I still need these things that heaven promised, and I'm not willing to live without them. I don't think I will continue to live after I'm dead, so if I am to achieve these things I must try to bring them about – and encourage other people to bring them about – on earth, in a republic in which we are all free and equal – and responsible – citizens. Now, what does this involve? It involves all the best qualities of things. We mustn't shut anything out. If the Church has told us, for example, that forgiving our enemies is good, and if that seems to be a good thing to do, we must do it. If, on the other hand, those who struggled against the Church have shown us that free enquiry and unfettered scientific exploration is good – and I believe that they have – then we must hold this up as a good as well. Whatever we can find that we feel to be good – and not just feel but can see with the accumulated wisdom that we have as we grow up, and read about history and learn from our own experiences and so on – wherever they come from, and whoever taught them in the first place, let's use them and do whatever we can do to make the world a little bit better.”

“Everything about this is embarrassing" she said. "D'you know how embarrassing it is to mention good and evil in a scientific laboratory? Have you any idea? One of the reasons I became a scientist was not to have to think about that kind of thing.”