I agree with you. But I would phrase it differently: "A common language unites". We should not forget that at different times in different areas we had and to s

I agree with you. But I would phrase it differently: "A common language unites". We should not forget that at different times in different areas we had and to some extent still have different common languages (Greek, Latin, French, Arabic, Spanish). It seems that humans have such a strong desire to communicate across borders (cultural, inherited, political, etc.) that they will invent the necessary tools. English language is such a tool now. I wouldn't be surprised if in future it will be some other language. In the end, there will maybe one such common language accepted by all.