The Sustaining Activity
Sthiti ('standing,' 'maintenance,' 'sustenance') is the second of the five cosmic activities (pañca-kṛtya): sṛṣṭi (creation), sthiti (sustenance), saṃhāra (dissolution), tirodhāna (concealment/obscuration), and anugraha (grace). While sṛṣṭi brings the world into manifestation, sthiti is the ongoing divine activity that keeps it in existence from moment to moment.
Continuous Divine Support
The Bhagavad Gītā expresses sthiti through verses like: gām āviśya ca bhūtāni dhārayāmy aham ojasā — 'Entering the earth, I sustain all beings by My power.' This is not a one-time act but a continuous infusion of divine energy that prevents creation from collapsing back into chaos. Without this constant sthiti, nothing could persist for even a moment.
Sthiti in Each Being
At the individual level, sthiti means the Lord as antaryāmin (inner controller) continuously sustains the jīva's consciousness, its bodily functions, its capacity for experience and action, and its karma-ripening across lifetimes. The jīva does not sustain itself — it is sustained at every moment by the Lord's sthiti-function.
Viṣṇu as the Sustainer
In the classical Trinitarian theology of Brahma-Viṣṇu-Śiva (creator-sustainer-dissolver), Viṣṇu is specifically associated with sthiti. While Sri Vaishnava theology holds that Viṣṇu alone performs all five activities (not sharing them with separate deities), the association of sthiti with Viṣṇu/Nārāyaṇa is the specific entry point through which the tradition emphasizes the centrality of Viṣṇu.