Why: wherever Krishna, the Lord of yoga, and Arjuna, the wielder of the bow, are, there will surely be prosperity, victory, welfare, and firm resolve, this is my belief, closing the entire text on a note of confident hope rather than uncertainty, tying wisdom paired with committed action to genuinely good outcomes.

In life: the actual, practical promise underlying this entire eighteen-chapter conversation comes down to something simple in the end, genuine wisdom paired with committed, willing action tends to produce real prosperity and welfare, not wisdom alone, and not action alone, but the two held together.

Teaching: as you close out your own engagement with this text, or with any significant period of learning, hold onto this final, practical formula, pair whatever genuine wisdom you've gained with actual, committed action, that combination, this closing verse insists, is what genuinely produces welfare and lasting good in a life, not either half alone.