The limits of my language mean the limits of my world. (Die Grenzen meiner Sprache bedeuten die Grenzen meiner Welt.)
Spanish is a Romance language (derived from Latin), and there are roughly 362 million first-language speakers in at least 39 territories. As well as being the primary language of Spain, it has been established since the 16th century as the dominant language of most of southern and central America, and there are also 28 million first-language speakers in the United States.
Modern Spanish originated from the region of Castile, hence the alternative name of Castilian.