Akilattirattu Ammanai, often referred to as Akilam, stands at the heart of Ayyavazhi as its primary and most authoritative scripture. It is regarded as a revealed chronicle that lays out the theological framework, religious practices, and spiritual vision of this monistic tradition. Within its verses, it unfolds a vast sacred history, narrating the origin of the universe, the succession of cosmic ages, and the unfolding drama of creation, decline, and renewal. In doing so, it offers a unified cosmology that integrates deities, worlds, and epochs under a single transcendent principle, while reinterpreting familiar Hindu narratives through a distinctively Ayyavazhi lens.

At the center of this revelation stands Ayya Vaikundar, whose life and mission are given definitive form in Akilam. The text portrays Vaikundar as a divine incarnation with a unique salvific role in the present age, describing his activities, miracles, and teachings as the culmination of a long-prepared divine plan to overcome evil and restore righteousness. It records his words and deeds as both spiritual instruction and historical narrative, and it presents the coming of an era of righteousness as the fruit of this redemptive work. In this way, Akilam functions simultaneously as biography, prophecy, and theological charter.

Beyond its cosmological and theological scope, Akilattirattu Ammanai also serves as a guide for ethical and social life. It lays down norms of conduct and devotion, explicitly challenging caste oppression and ritual hierarchy, and it places strong emphasis on social equality and the upliftment of marginalized communities. Its message has inspired communal worship, moral discipline, and a sense of distinct religious identity that remains rooted in, yet clearly differentiated from, broader Hindu traditions. Through its recitation and exposition in pathis and other centers of worship, the text continues to shape the devotional life, collective memory, and spiritual aspirations of Ayyavazhi followers.