what is the real message that Roled Dahl wants to convey to the reader of the story

Roald Dahl uses a book about chocolate, the ultimate indulgence, to relay a message about the dangers of greed. All four of the naughty children are greedy in some way: Augustus is a glutton; Veruca is a spoiled brat; Violet is greedy for gum, and Mike is greedy for television. This book illustrates how greed can consume and ultimately destroy a person, particularly children, since each child is changed forever as a result of his or her greed.