Bhagavad Gita Chapter 4, Verse 7

यदा यदा हि धर्मस्य ग्लानिर्भवति भारत | अभ्युत्थानमधर्मस्य तदात्मानं सृजाम्यहम् ||

yadā yadā hi dharmasya glānir bhavati bhārata abhyutthānam adharmasya tadātmānaṁ sṛjāmy aham

Whenever there is decline of righteousness and rise of unrighteousness, O Bharata, at that time I manifest Myself.

Krishna reveals the purpose behind divine appearance. He manifests (sṛjāmi ātmānam) not randomly, but when two conditions meet: 'glāniḥ dharmasya' (decline of righteousness) and 'abhyutthānam adharmasya' (rise of unrighteousness). This is the answer to 'Why now? Why here?' The timing isn't arbitrary—it's purposeful. When righteousness weakens and unrighteousness grows, divine intervention appears to restore balance. This connects back to verse 4.2 (yoga was lost) and forward to verse 4.8 (purpose of restoration). The word 'yadā yadā' (whenever) shows this is a pattern, not a one-time event. Throughout history, whenever the balance tilts too far, restoration appears.