Hindu Philosophy Schools — Key Changes

Entry	Year	Description	Impact
Doctrinal Shift 1	8th Century CE	Adi Shankara's formulation of Advaita Vedanta represented a significant 'amendment' or reinterpretation of earlier Vedic and Upanishadic thought. While rooted in the Brahma Sutras, Shankara's radical non-dualism, positing the ultimate identity of Atman and Brahman and the illusory nature of the world (Maya), was a departure from more pluralistic or realistic interpretations prevalent before him. This intellectual 'amendment' reshaped the landscape of Hindu philosophy.	Led to the intellectual revitalization of Hinduism, challenged rival schools, established Advaita as a dominant philosophical system, and profoundly influenced subsequent spiritual movements and the understanding of ultimate reality within Hinduism.
Doctrinal Shift 2	11th-13th Century CE	The emergence of Vishishtadvaita (Ramanuja) and Dvaita (Madhva) Vedanta represented significant 'amendments' to Shankara's Advaita. These schools offered alternative interpretations of the Brahman-Atman relationship, emphasizing qualified non-dualism and dualism respectively, often integrating Bhakti (devotion) as a central path to liberation. They sought to reconcile the personal aspect of God with the impersonal Brahman.	Provided diverse theological and philosophical options within Vedanta, fueled the Bhakti movement, made philosophy more accessible to the common person through devotion, and led to a rich tradition of Vaishnava theology.
Doctrinal Shift 3	Circa 13th Century CE	The development of Navya-Nyaya (New Logic) by Gangesha Upadhyaya in Mithila was a profound 'amendment' to the classical Nyaya school. It introduced highly refined and technical methods of logical analysis, particularly in the theory of inference and language. This shift made Nyaya even more precise and abstract, influencing scholastic traditions across India.	Elevated the rigor of Indian logic, influenced all subsequent philosophical and legal discourse, and created a new intellectual tradition that focused on minute distinctions and precise definitions, making it a formidable tool for philosophical debate.