This is perhaps the most honest meditation instruction ever given. The mind will wander. That much is certain. Krishna does not pretend otherwise. Instead he offers the simplest possible remedy: wherever it goes, bring it back. Again and again. Every single time.
Think of a mother with a toddler near a busy road. The child runs off. She picks him up, sets him down safely. He runs off again. She brings him back — not with anger, but with steady patience. That is exactly how Krishna wants the seeker to treat the wandering mind. No frustration. Just gentle, persistent return.
The real practice of meditation is not the moment of stillness. It is the moment of return. Every time the mind wanders and you bring it back, that is one rep of the exercise. That is the work.