There was a wall. It did not look important. It was built of uncut rocks roughly mortared. An adult could look right over it, and even a child could climb it. Where it crossed the roadway, instead of having a gate it degenerated into mere geometry, a line, an idea of boundary. But the idea was real. It was important. For seven generations there had been nothing in the world more important than that wall. Like all walls it was ambiguous, two-faced. What was inside it and what was outside it depended upon which side of it you were on.
Ursula K. Le GuinThe Earth is beautiful, and bright, and kindly, but that is not all. The Earth is also terrible, and dark, and cruel.
Ursula K. Le GuinSafety lies in catering to the in-group. We are not all brave. All I would ask of writers who find it hard to question the universal validity of their personal opinions and affiliations is that they consider this: Every group we belong to - by gender, sex, race, religion, age - is an in-group, surrounded by an immense out-group, living next door and all over the world, who will be alive as far into the future as humanity has a future. That out-group is called other people. It is for them that we write.
Ursula K. Le Guin