Axiomatically true.

But how when words are one yet meanings are not? Even after extended discourse at the level of person to person interaction, semantics remain context dependent to the point of complete incommensurability.

"Eyes and ears are bad witnesses to men if they have souls that understand not their language." "Gleiche Sprache sprechend, verstanden die Menschen sich nicht." "Babel. Lobgesang des Einen wurde Fluch der Andern."

"The more I think about language, the more it amazes me that people ever understand each other at all."

Certainty demands; "I've known you for ten years."

"But isn't that the cause of all the trouble? Words! We all have a world of things inside ourselves and each one of us has his own private world. How can we understand each other if the words I use have the sense and the value that I expect them to have, but whoever is listening to me inevitably thinks that those same words have a different sense and value, because of the private world he has inside himself too. We think we understand each other: but we never do. Look!"

Reality teaches; "You've yet to know me for ten seconds."