Actually there is only need for one language. The language of LOVE, which is universal, and also God's preferred mode of communication. Love is all! However, not everyone really understands this universal language, and therefore knowledge with other languages comes in handy.
The best thing about being bi-lingual, or multi-lingual, is that we can come to terms with the truth that words are just that, words. Our actions and reactions are the same in any language. And although there are as many different words for love as there are languages, there is only one God and only one way of saying I love you. Love is eternally ours.
But seriously, there are some advantages in knowing more than one language. One is that some great people have written in a language that is not our own, and although great writers always find a willing translator or two, there is no substitute for reading in the original. That way the "middle man" is taken out of the meaning, and perhaps, if we grasp the foreign language well, we also get all the little nuances, which may hold the key to understanding the true meaning and intent of the author. Some languages are better adapted than others at expressing certain sentiments. I have heard arguments that a romantic exchange between two enamored souls sounds more romantic in Italian or French. Perhaps it's in the accent.
This Christmas one of my daughters gave me, as a gift, a book; Leadership in Turbulent Times, by Doris Kearns Goodwin. I'm looking forward to reading it, since it seems that the current US political situation is in turbulent times, and we need more love than hate with our divide.