Telling someone something he does not understand is pointless, even if you add that he will not be able to understand it. (That so often happens with someone you love.) If you have a room which you do not want certain people to get into, put a lock on it for which they do not have the key. But there is no point in talking to them about it, unless of course you want them to admire the room from outside! The honourable thing to do is to put a lock on the door which will be noticed only by those who can open it, not by the rest.
If a sign is not necessary then it is meaningless. That is the meaning of Occam’s razor. (If everything in the symbolism works as though a sign had meaning, then it has meaning.)
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In order to avoid these errors, we must employ a symbolism which excludes them, by not applying the same sign in different symbols and by not applying signs in the same way which signify in different ways. A symbolism, that is to say, which obeys the rules of logical grammar — of logical syntax. (The logical symbolism of Frege and Russell is such a language, which, however, does still not exclude all errors.)