Vaishnava Samhita. Haseena Charitam. Vol II Book VI Chp 11 Shloka 4

अजकण्ठस्तु सूनायां यथा शस्त्रोण भिद्यते  I
ह्रदयं पण्डितानाञ्च तथा शास्त्रेण भिद्यते  II 

As a goat's neck is cut by a knife in the butcher's shop the hearts of great scholars are broken by the pedagogic discussions of the Shastras.