The rapid advancement of digital technology and social change has profoundly impacted today's young Christians' moral and spiritual lives, evident in declining values, identity crises, and a serious gap between profession and practice. This demands robust character grounded in biblical truths and a comprehensive understanding of holiness. This article seeks to reconstruct and deepen the concept of holiness from 1 Peter 1:14-16 and to examine its practical relevance for Christian Religious Education (PAK) teachers in shaping adolescent character. By employing a qualitative descriptive approach and theological exposition of scriptural, theological, and academic literature, this study explores holiness comprehensively. The findings indicate that holiness in this passage is not merely a moral demand or legalistic rule, but a divine calling to share in God's holy nature, realized through continuous sanctification by the Holy Spirit. Thus, holiness is understood not only as a normative concept, but as an essential transformative life practice that forms spiritually mature adolescents firmly rooted in Christian values.
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