《The Very Hungry Caterpillar》的主題是「希望」（hope），小朋友就像小小毛毛蟲一樣，會漸漸長大，展翅邁向未來。
Original text quoted from Eric Carle's official Facebook page:
When asked why he thinks The Very Hungry Caterpillar has remained popular for so long, Carle said, “I think it is a book of hope. Children need hope. You, little insignificant caterpillar can grow up into a beautiful butterfly and fly into the world with your talent.”
Thank you, Eric Carle for sharing your great talent with so many generations of young readers.