Catholic missionary activity in the Dutch East Indies developed within a colonial environment in which evangelization was frequently intertwined with European political and cultural assumptions. Previous studies had largely emphasized the historical and theological significance of Maximum Illud but had given less attention to how its principles became institutionalized within the Indonesian Church. This study aimed to analyze the paradigm shift in Catholic mission after the promulgation of Maximum Illud in 1919 and to examine its social and institutional implications, particularly for the formation of indigenous clergy and local ecclesiastical autonomy. The study employed a qualitative historical-sociological approach based on documentary and literature analysis. Maximum Illud, relevant Church documents, historical studies, and scholarly literature were analyzed through qualitative content analysis and interpreted using Peter L. Berger's concepts of externalization, objectification, and internalization. The findings showed that Maximum Illud functioned as a socio-theological catalyst that challenged Eurocentric missionary structures and contributed to a process of spiritual decolonization. It strengthened and legitimized an emerging orientation toward indigenous clergy, which became increasingly institutionalized through the development and consolidation of seminaries such as Mertoyudan, Mataloko, Ledalero, and Ritapiret. The study concluded that this transformation gradually redistributed ecclesiastical agency from predominantly foreign missionary personnel toward locally formed clergy and contributed to the emergence of a more locally rooted and increasingly autonomous Indonesian Catholic Church. The study contributed an integrated historical-sociological explanation of how missionary theology acquired institutional and social consequences, thereby extending interpretations of Maximum Illud beyond theological discourse toward the analysis of local Church formation, religious agency, and institutional transformation.
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