Still, I found this passage from Chapter 5 of Through the Looking Glass. I've italicized the bits I find the most interesting:
"Only it is so very lonely here!" Alice said in a melancholy voice; and, at the thought of her loneliness, two large tears came rolling down her cheeks.
"Oh, don't go on like that!" cried the poor Queen, wringing her hands in despair. "Consider what a great girl you are. Consider what a long way you've come to-day. Consider what o'clock it is. Consider anything, only don't cry!"
Alice could not help laughing at this, even in the midst of her tears. "Can you keep from crying by considering things?" she asked.
"That's the way it's done," the Queen said with great decision: "nobody can do two things at once, you know. Let's consider your age to begin with - how old are you?"
"I'm seven and a half, exactly."
"You needn't say 'exactly'," the Queen remarked. "I can believe it without that. Now I'll give you something to believe. I'm just one hundred and one, five months and a day."
"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. There goes the shawl again!"
The brooch had come undone as she spoke, and a sudden gust of wind blew the Queen's shawl across a little brook. The Queen spread out her arms again and went flying after it, and this time she succeeded in catching it herself. "I've got it!" she cried in a triumphant tone. "Now you shall see me pin it on again, all by myself!"
"Then I hope your finger is better now?" Alice said very politely, as she crossed the little brook after the Queen.