Not everything is open to doubt, or else we would not be able to understand one another. Similarly, not everything is open to interpretation. If we lived in a society where writing out the series "add two," was open to interpretation, or where the rule wa s constantly interpreted in different ways without there being any means of agreement on how to interpret it, such rules would lose their point entirely. In dismissing the idea that there is any absolute standard for correctness in interpreting a rule, Wi ttgenstein is not telling us that rules are not as solid or definite as we may think. On the contrary, he is telling us that if rules were the kinds of things that constantly required interpretation and justification, they would not be of any use to us at all.