False Knowledge
Viparyaya (literally 'reversed' or 'inverted') means false knowledge — cognition that appears certain and settled but is actually wrong. The classic example in Vedanta is rajju-sarpa-bhrānti — mistaking a rope for a snake in dim light. The perception appears real and prompts real fear, but is based on a fundamental misidentification.
The Root of Saṃsāra
Vedāntic texts identify viparyaya as the fundamental problem: the jīva holds false knowledge about its own nature and about Brahman. Key viparyayas: (1) 'I am this body' (deha-ātma-bhrānti); (2) 'worldly things bring lasting happiness' (taking the impermanent for the source of lasting joy); and (3) 'I am independent and self-sufficient' (svātantryam — ignoring the jīva's absolute dependence on Brahman). These perpetuate saṃsāra.
Remedy Through Vicāra
The remedy is vicāra — systematic philosophical inquiry guided by śāstra and ācārya. The Bhagavad Gītā and Upaniṣads provide the framework; the ācārya provides the lived embodiment of correct understanding. When viparyaya is corrected, saṃśaya may remain — it takes further practice and anubhava to move from intellectual clarity to settled certainty.
The Most Dangerous Viparyaya
For Piḷḷai Lokācārya and Maṇavāḷa Māmunigal, the most dangerous viparyaya is the false notion that one can attain liberation through one's own effort or merit, independent of the Lord's grace. This 'self-sufficiency delusion' is exactly what the teaching of prapatti and total dependence (pāratantrya) is designed to correct.