In this excerpt from Lewis Carroll's Alice's Adventures in Wonderland and Through the Looking Glass, a conversation takes place between Alice and a unicorn. Alice admits that she has always thought of unicorns as wonderful but mythical creatures she has never encountered in real life.
The unicorn responds by suggesting a mutual belief system: if Alice believes in it, then it will believe in her too. This highlights themes of imagination, faith, and the power of believing in the fantastical within the whimsical world Carroll created.