Friedrich Nietzsche wrote many warnings about the dangers of morality. Morality is dangerous when it harms the best people and favours the people beneath them, says Nietzsche. He explains master and slave as two different approaches to values and morals. The first approach values noble things like honour, courage, self-worth, and excellence. These people value things based on what they see rather than what they are told. The second approach is what Nietzsche calls a weakness. It values things like sameness and pity. He also calls these "priestly values" because they are often to people by priestly religions. He says the ancient Hebrews were an example of priestly culture, and the ancient Romans were an example of a noble culture.