Philosophy: Nirguna and Saguna Brahman

The Bhakti movement of Hinduism saw two ways of imaging the nature of the divine (Brahman) – Nirguna and Saguna. Nirguna Brahman was the concept of the Ultimate Reality as formless, without attributes or quality. Saguna Brahman, in contrast, was envisioned and developed as with form, attributes and quality.

The two had parallels in the ancient pantheistic unmanifest and theistic manifest traditions, respectively, and traceable to Arjuna-Krishna dialogue in the Bhagavad Gita. It is the same Brahman but viewed from two perspectives, one from Nirguni knowledge-focus and the other from Saguni love-focus, united as Krishna in the Gita.

Nirguna bhakta's poetry were Jnana-shrayi or had roots in knowledge. Saguna bhakta's poetry were Prema-shrayi, or with roots in love.

In Bhakti, the emphasis is reciprocal love and devotion, where the devotee loves God, and God loves the devotee. Jeaneane Fowler states that the concepts of Nirguna and Saguna Brahman, at the root of Bhakti movement theosophy, underwent more profound development with the ideas of Vedanta school of Hinduism, particularly those of Adi Shankara's Advaita Vedanta, Ramanuja's Vishishtadvaita Vedanta, and Madhvacharya's Dvaita Vedanta.

Two 12th-century influential treatises on bhakti were Sandilya Bhakti Sutra – a treatise resonating with Nirguna-bhakti, and Narada Bhakti Sutra – a treatise that leans towards Saguna-bhakti. Nirguna and Saguna Brahman concepts of the Bhakti movement has been a baffling one to scholars, particularly the Nirguni tradition because it offers, states David Lorenzen, "heart-felt devotion to a God without attributes, without even any definable personality".

Yet given the "mountains of Nirguni bhakti literature", adds Lorenzen, bhakti for Nirguna Brahman has been a part of the reality of the Hindu tradition along with the bhakti for Saguna Brahman. These were two alternate ways of imagining God during the bhakti movement.