। ॥ ४८ ॥
In plain words
Only to those fully equipped with the four Sādhanas, the disciplines of realization, who gladden the teacher through devoted service and whose inner being is pure, should this Brahmavidyā — knowledge of Brahman — be imparted.
Close to the Sanskrit
Those endowed with the four Sādhanas, the means of realization, who please the teacher by their service — to those alone whose inner being is pure should one impart this Brahmavidyā, the knowledge of Brahman.