Bhashya
विद्यते, किं तस्यान्वेषणेन विजिज्ञासनेन वा फलं विजिज्ञासितुः स्यात्? अतः यत्तत्रान्वेष्टव्यं विजिज्ञासितव्यं वा न तेन प्रयोजनमित्युक्तवतः स आचार्यो ब्रूयादिति श्रुतेर्वचनम् ॥
In plain words
What fruit could possibly come to someone through searching or inquiring into that? Therefore, this is the declaration of the shruti regarding what the teacher should say to one who has stated that no purpose is served by what is to be sought or inquired after.
Close to the Sanskrit
Does any fruit exist for the seeker through searching or through inquiring into that? Hence, such is the utterance of the shruti that that teacher, of one who has said 'there is no purpose with that which is to be sought out or inquired after', should speak.