The famous poet-philosopher Wolfgang Johann von Goethe once said, "He who does not know another language, does not know his own."
Studying a foreign langugage forces one to come to grips with the structure of one's own language since there must be something to which one can relate the learning of the new language. Of course, if one speaks English and studies Latin or Greek, for instance, the student learns the roots of many English words. With the Norman Conquest of 1066 effecting French as the official language and the written language of early literature in England, a study of French provides the English speaker with insights into both grammar and vocabulary and structure.
The study of any foreign language helps a student to step "outside the box" of one's own culture and learn, not only of another culture, but also perceive all it means to be of one's own culture. For, language is culture. To quote Goethe again,"Learning another language is to acquire another soul."