All his writings contain numerous references to God, and he saw his work as a fulfilment of his Christian duty to understand the works of God. Man being, as Kepler believed, made in the image of God, was clearly capable of understanding the Universe that He had created.
Ang lahat ng kanyang mga writings naglalaman ng maraming mga reference sa Diyos, at nakita niya ang kanyang trabaho bilang isang pagtupad ng kanyang tungkulin Kristiyano upang maunawaan ang mga gawa ng Diyos. Man ini, bilang Kepler sumampalataya, na ginawa sa imahe ng Diyos, ay malinaw na may-unawa ang Universe na Siya ay nilikha.