। ॥ ५२१ ॥
In plain words
Seeing his finest disciple bowed before him, now truly steeped in the bliss of the Self and fully awake to the truth, the great teacher's heart filled with joy - and once more, that great soul spoke these supreme words.
Close to the Sanskrit
Thus, having looked upon the best of disciples, bowed [in reverence], who had fully attained the bliss of the Self, whose understanding of the truth had fully awakened, the foremost of teachers, his heart filled with joy, that great soul, spoke this supreme utterance again.