This Alice in Wonderland quote comes from a scene where Alice talks to the Daisies:
"If you don't hold your tongues, I'll pick you!"
Alice comes to a garden with a large flower bed bordered by daisies and a willow-tree growing in the middle. Alice wishes that the flowers could talk and becomes speechless for a while when the Tiger-Lily answers her. The Lily explains that all flowers can talk but because most garden beds are so soft the flowers in them are always sleeping. This garden has a very hard ground and so the flowers are awake and can talk when they are addressed first. Suddenly all the daisies start talking and shouting at the same time and Alice shuts them up by whispering these scary words!
More quotes from Alice, Mad Hatter, Cheshire Cat and the Red Queen can be found in here:
Top 10 Alice in Wonderland Quotes