Alice in Wonderland quote

Alice laughed. "There's no use trying," she said: "one can't believe impossible things." "I daresay you haven't had much practice," said the Queen. "When I was your age, I always did it for half-an-hour a day. Why, sometimes I've believed as many as six impossible things before breakfast." (Through the Looking Glass, Chapter 5)

Try and spend half an hour every day thinking the impossible - it's great fun once you've thought of something suddenly it doesn't seem quite so improbable...