What happens when the practice described in 6.25 and 6.26 bears fruit? Krishna answers: supreme happiness. Not ordinary pleasure, not fleeting excitement — uttamam sukham, the highest joy there is.
Three conditions describe this yogi. His mind is deeply peaceful. His rajas — that restless, agitated energy that keeps the mind spinning — has gone quiet. And he has become 'brahma-bhuta': one with Brahman. That last phrase is striking. A drop of water that merges into the ocean does not disappear. It becomes the ocean. That is the state Krishna points to.
The word 'akalmasha' — spotless, free from impurity — rounds out the picture. This is not joy earned through struggle. It is the natural state that emerges when agitation falls away, the way clear sky appears when clouds move on.