Mahāpātakī — The Great Sinner Redeemed by Grace
Mahāpātakī (Sanskrit: mahā = great + pātaka = sin/fall; 'one who has greatly fallen') refers to a person who has committed severe transgressions — traditionally the five mahā-pātakas of Dharmaśāstra (brahmahatyā, theft of gold, consuming alcohol, violating the teacher's bed, association with such sinners).
Śrī Vaiṣṇava Reinterpretation: While the Dharmaśāstra tradition provides ritual expiation for these sins, the Śrī Vaiṣṇava tradition expands the concept: the gravest mahā-pātaka in devotional terms is āchārya apachāram (offending the Āchārya) and bhāgavata apachāram (offending the devotees of Bhagavān). These transgressions are considered more severe than conventional mahā-pātakas because they obstruct the very means of liberation.
The Grace That Redeems: A recurring theme in Anthimopāya Niṣṭhā is that even the mahāpātakī — one who has committed the gravest offences — is not beyond the reach of Bhagavān's grace or the Āchārya's compassion. The Āzhvār pāsurams frequently address this: 'I, the greatest of sinners, was claimed by the Lord.' This is the upāya (means) school of grace — salvation is not earned but given.
Practical Teaching: The teaching comforts sincere disciples burdened by past wrongdoing and humbles those who consider themselves free of fault — for the same grace that reaches the mahāpātakī is the only grace anyone has.