Completely true! Not only does it broaden your mindset, but knowing more than one language will open up so much new information you can consume. There will always be books, articles, documentaries and papers that will never be translated to your native language and being able to consume that infromation will realy put you at an advantage in life in the long run.
At this point I only know two languages Lithuanian my native tongue and english. I'd love to tackle japanese language at some point, such a delicate and expressive language, you can never translate their work's just right.