Bhagavad Gita · Chapter 2: The Path of Understanding

Bhagavad Gita 2.62

dhyāyato viṣayānpuṃsaḥ saṅgasteṣūpajāyate | saṅgāt saṃjāyate kāmaḥ kāmātkrodho'bhijāyate ||

When a person dwells on sense objects, attachment to them arises. From attachment comes desire, and from desire comes anger.

Modern context

Krishna traces a downfall step by step, and it starts with nothing more than thinking about something repeatedly. Dwelling on a thing breeds attachment; attachment becomes craving; craving, when blocked, turns to anger. The practical lesson is that the chain is easiest to break at its first link, in what we allow our attention to return to.