The strongest grip

tasmādyasya mahābāho nigṛhītāni sarvaśaḥindriyāṇīndriyārthebhyastasya prajñā pratiṣṭhitā

So, mighty-armed one, the one whose senses are fully held back from their objects has wisdom that stands firm.

What it means

Krishna sums up. The person whose senses are fully held in check, drawn back from their objects at will, has steady wisdom. It echoes the tortoise from a few verses before. Mastery isn't rejecting the world. It's being able to choose your response to it.

The story

Krishna calls Arjuna mahabaho, mighty-armed. He's pointing to a strength greater than his famous bow arm. Arjuna can draw back a bowstring like no one else. Now Krishna asks him to draw back his mind.

In your life

Imagine a recovering gambler walking past a casino and choosing to keep walking. That's the strongest muscle there is. Practise it in something small today. One urge, noticed, and let pass.