This research analyzes the notion of the perfection of cosmic reality based on Old Javanese concepts in the TantuPanggělaran (TP) text. It is aimed at elaborating the idea of the perfection of cosmic reality in the TP text through the manifestation of the Highest God. This is qualitative research which utilizes theories and concepts on space known within the philosophy of the Old Javanese society. The research is significant, for it complements the existing knowledge on the Javanese culture, especially the Old Javanese culture from the era of late Majapahit to the present as one of potential sources of local wisdom. Theoretically, this research offers a new paradigm towards Old Javanese texts using the theories and concepts on space from the philosophy of the Old Javanese society itself. The result of the research is that the manifestation of the Highest God in the TP text represents the perfection of the cosmic reality over the relationship between the Highest God and the humans as well as nature in the Saiwa-Buddha concept. © Published under licence by IOP Publishing Ltd.