According to Frederic Farrar, Martin Luther did not understand inspiration to mean that the scriptures were dictated in a purely mechanical manner. Instead, Luther "held that they were not dictated by the Holy Spirit, but that His illumination produced in the minds of their writers the knowledge of salvation, so that divine truth had been expressed in human form, and the knowledge of God had become a personal possession of man. The actual writing was a human not a supernatural act." John Calvin also rejected the verbal dictation theory.