Friends are not agreeable to friends, however accomplished they might be. Foolish pedantic men (ever) find fault with the virtue of their preceptors.
समृद्धैश्च न नन्दन्ति बान्धवा बान्धवैरपि। गुरूंश्चैव विनिन्दन्ति मूढाः पण्डितमानिनः॥