“I can’t believe that!” said Alice.

“Can’t you?” the queen said in a pitying tone. “Try again, draw a long breath, and shut your eyes.”

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.”

Lewis Carroll

Through The Looking Glass

(Found in And I Quote:  The Definitive Collection of Quotes, Sayings, and Jokes for the Contemporary Speechmaker)