The phenomenon of rational theology arises at the moment when there is a need to adapt traditional or new religious ideas to contemporary and characteristic intellectual practices. The case of Philo of Alexandria can serve as a good example of what happens when two different cultural traditions begin the mutual translation of discourses. We analyze how this affects the most important theological concepts of Philo on the basis of the treatise De opificio mundi. We pay attention to three points: 1. Philo’s assessment of the cosmogonic and historical narrative of Moses as a metaphysical prologue to his legislation; 2. Philo’s interpretation of natural law and natural being as an allegory of metaphysical and moral law; 3. Aristotle’s “motives” in Philo’s description of the activities of God the Creator. It can be concluded that Philo interprets the Greek philosophical language as a completely acceptable way of reading both the laws of nature and the Jewish Scriptures (he explains this through the “borrowing hypot