"Let us define this. What is meant by the expression "black and white"? It means good and evil. Before you can identify anything as gray, as middle of the road, you have to know what is black and what is white, because gray is merely a mixture of the two. And when you have established that one alternative is good and the other is evil, there is no justification for the choice of a mixture. There is no justification ever for choosing any part of what you know to be evil."

- Ayn Rand, 1964