From the beginning, Pak's main poetic theme was the absolute distance between 'reality (self)/ideal (God)' and the difficulty of life due to it. However, as the sense of 'non-duality', an Eastern aesthetic, began to influence his poetic world, Pak realized the fundamental continuity inherent in 'reality/ideal' and gradually moved away from his dualistic attitude toward the world. It is noteworthy that the revelation of 'non-duality', an Eastern aesthetic, in his poetic world should not be taken as a weakening of the Christian worldview. Rather, it is more accurate to say that he came to maturity in contemplating the 'self/God' relationship because of Eastern monism. Whereas classical theism, the mainstream view of Western Christianity, conceived of the relationship between the self and God in terms of binary, oppositional, and vertical relationships (e.g., real/ideal, earthly/heavenly, and below/above), Pak gradually escaped the limitations of classical theism with the help of Eastern aesthetics.