You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Martin_Luther

Context:
Luther's Small Catechism proved especially effective in helping parents teach their children; likewise the Larger Catechism was effective for pastors. Using the German vernacular, they expressed the Apostles' Creed in simpler, more personal, Trinitarian language. He rewrote each article of the Creed to express the character of the Father, the Son, or the Holy Spirit. Luther's goal was to enable the catechumens to see themselves as a personal object of the work of the three persons of the Trinity, each of which works in the catechumen's life. That is, Luther depicted the Trinity not as a doctrine to be learned, but as persons to be known. The Father creates, the Son redeems, and the Spirit sanctifies, a divine unity with separate personalities. Salvation originates with the Father and draws the believer to the Father. Luther's treatment of the Apostles' Creed must be understood in the context of the Decalogue (the Ten Commandments) and the Lord's Prayer, which are also part of the Lutheran catechical teaching.

Question:
What are the Catechisms of Martin Luther written in?

German vernacular