“I have a fairy by my side Which says I must not sleep, When once in pain I loudly cried It said "You must not weep" If, full of mirth, I smile and grin, It says "You must not laugh" When once I wished to drink some gin It said "You must not quaff". When once a meal I wished to taste It said "You must not bite" When to the wars I went in haste It said "You must not fight". "What may I do?" at length I cried, Tired of the painful task. The fairy quietly replied, And said "You must not ask". Moral: "You mustn't.”
“I wish,' said Rose anxiously, 'I understood you.' 'Don't try,' said Lotty, smiling. 'But I must, because I love you.”
“You must not quote to me what I once said. I am wiser now.”
“Owl,' said Rabbit shortly, 'you and I have brains. The others have fluff. If there is easy thinking to be done in this Forest - and when I say thinking I mean thinking - you and I must do it.”
“You must have been determined, I said. Well, no, no, you don't think of it like that, she said, you just find what you must do, and you do it.”
“You people with hearts,' he said once, 'have something to guide you, and need never do wrong; but I have no heart, and so I must be very careful.”