Should you ever doubt the importance of punctuation in clarifying the meaning of words, I present you two paragraphs from Avi's delightful book, A Beginning, A Muddle, and an End: The Right Way to Write Writing.
Each paragraph has the exact same words, but different punctuation. Notice how the punctuation affects the meaning.
1) "Avon! Don't forget all I said. You must not! Speak the truth about what happened! Things will be better, I think. To lie about the truth, it never helps!"
2) "Avon, don't! Forget all I said. You must not speak the truth about what happened. Things will be! Better, I think, to lie. About the truth . . . It never helps!"
Thank you, Avi, for showing us that when it comes to matters of punctuation, punctuation matters!