"It does not do to dwell on dreams and forget to live, remember that. [...] I see myself holding a pair of thick, woollen socks [in the mirror of Erised] - Albus Percival Wulfric Brian Dumbledore"
Harry Potter and the Philosopher's Stone  - J.K. Rowling

Harry Potter and the Philosopher's Stone, Signature Edition, Bloomsbury Publishing PLC, p. 231