Kasten concludes that the Biblia Alfonsina is a "monument of the Spanish language." He posits that its neglect in later centuries was due to the Catholic Church's suspicion of vernacular translations, yet he asserts that it remained the hidden standard for Spanish biblical language until the Reformation.

The Biblia Alfonsina, also known as the "Alfonsine Bible," was created during the reign of King Alfonso X of Castile (1252-1284). This monarch, also known as Alfonso the Wise, was a patron of learning and literature, and his court attracted scholars and intellectuals from across Europe. The Biblia Alfonsina is one of the most famous and influential Bibles produced during this period, containing the Old and New Testaments, as well as apocryphal texts.