How did Mikael Agricola create a Finnish literary language?

Mikael Agricola, a 16th-century Lutheran bishop, is recognized as the creator of the Finnish literary language. He established this written tradition by producing the first books in the Finnish language, beginning with an alphabet book published in 1543.12

Agricola further developed the language by translating the New Testament into Finnish, a work that appeared in 1548. These efforts provided the foundational written texts that allowed Finnish to emerge as a literary medium during the period of Swedish rule.321