I always thought men had telepathy, that is, they could express their ideas without speaking with each other using their mouths before the events from the tower of babel. Or, at least a gift from God similar to the one known as Pentecost.

Sometimes we don't agree, despite of the use of a common language. I always thought this was an indication that our minds (the way we think individually) is not in harmony with how every other person thinks.

I'm curious what other opinions are out there, but until now, I see the spirit of the tower of babel as the source of two kind of confusions; the first is on the tongue (languages), and the second is on the minds (ideas). That's part of the reason why not even those who speak the same language get along well with each other.